Online Resource

Mathew, Bincy, 1979- author

Create a simple CSS folded-corner effect without images or extra markup. It works well in all modern browsers and is best suited to designs with simple colour backgrounds.

Demo: Pure CSS folded-corner effect

Known support: Firefox 3.5+, Chrome 4+, Safari 4+, Opera 10+, IE 8+

This post is going to expand on the technique used to create the folded-corner effect that is part of the demo page for Multiple Backgrounds and Borders with CSS 2.1. As a starting point it will look to recreate the appearance of the note style used on the Yiibu‘s fantastic web site. Where Yiibu uses images, this will use pseudo-elements.

Nothing complicated. Any element will do and there’s no need for extra markup. It’s just a simple coloured box to start with. Browsers with no support for pseudo-elements, such as IE6 and IE7, will only be capable of displaying this.

Adding position:relative makes it possible to absolutely position the pseudo-element.

.note {
  position: relative;
  width: 30%;
  padding: 1em 1.5em;
  margin: 2em auto;
  color: #fff;
  background: #97C02F;
}

The folded-corner

The folded-corner is created from a pseudo-element that is positioned in the top corner of the box. The pseudo-element has no width or height but is given a thick border. Varying the size of the border will vary the size of the folded-corner.

In this example, the top and right borders are set to colours that match the background colour of the box’s parent. The left and bottom border are then given a slightly darker or lighter shade of the box’s background colour.

.note:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 16px 16px 0;
  border-style: solid;
  border-color: #658E15 #fff;
}

This is all that’s needed to create a simple folded-corner effect like that found on Yiibu.

Firefox 3.0 doesn’t allow for the positioning of pseudo-elements. You can throw in a couple of extra styles to help tidy things up in that browser.

.note:before {
  ...
  display: block;
  width: 0;
}

Adding a subtle shadow

The appearance of a fold can be slightly enhanced by adding a box-shadow (for browsers that support it) to the pseudo-element. Setting overflow:hidden on the note itself will help hide parts of the shadow that would disrupt the folded-corner effect.

.note:before {
  ...
  -webkit-box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
  -moz-box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
  box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
}

Rounded corners

It’s also relatively simple to make this work with rounded corners if desired. Unfortunately, every modern browser has some form of border-radius bug – including those using the non-prefixed property – which means a slight work around is needed.

Webkit browsers are the only browsers that can come anywhere close to rounding the corner of the pseudo-element if it only has 2 borders. Opera 11 and Firefox 3.6 make a mess of it. Opera 11 makes the biggest mess.

Using 4 borders avoids the problems in Opera 11 and Firefox 3.6. But it will trigger a bug in Safari 5 that leaves the diagonal looking a little jaggy. We can get around this problem by setting at least one border colour to be transparent.

When a background colour is applied to the pseudo-element it will show through the transparent border. Ideally, this approach would form the basis of the entire effect because we could reduce the amount of code needed. But Opera 11 will not show the background colour through the transparent borders unless a border-radius has been set.

.note-rounded:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 8px;
  border-color: #fff #fff transparent transparent;
  background: #658E15;
  -moz-border-radius: 0 0 0 5px;
  border-radius: 0 0 0 5px;
  display: block;
  width: 0;
}

The CSS file on the demo page has more comments on the work arounds. Every browser has its own peculiarities when it comes to using border-radius or borders on elements with no width or height. This is the merely simplest solution I’ve found to deal with those browser inconsistencies.

The final code

This is all the CSS needed to create a simple folded-corner effect, with a subtle shadow, from a single HTML element. To include a variant with rounded corners, the “note” object can be extended with the modifications described previously.

.note {
  position: relative;
  width: 30%;
  padding: 1em 1.5em;
  margin: 2em auto;
  color: #fff;
  background: #97C02F;
  overflow: hidden;
}

.note:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 16px 16px 0;
  border-style: solid;
  border-color: #fff #fff #658E15 #658E15;
  background: #658E15;
  -webkit-box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
  -moz-box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
  box-shadow: 0 1px 1px rgba(0,0,0,0.3), -1px 1px 1px rgba(0,0,0,0.2);
  /* Firefox 3.0 damage limitation */
  display: block; width: 0;
}

.note.rounded {
  -moz-border-radius: 5px 0 5px 5px;
  border-radius: 5px 0 5px 5px;
}

.note.rounded:before {
  border-width: 8px;
  border-color: #fff #fff transparent transparent;
  -moz-border-radius: 0 0 0 5px;
  border-radius: 0 0 0 5px;
}

The demo page shows the final effect, an example with rounded corners, and how different coloured notes are easy to create from this base.

This technique works less well when the element receiving the folded-corner effect is sitting on top of a background image rather than a simple background colour. However, the same limitation exists for image-based methods of creating this effect.

State health officials are planning extensive tests

Weitzel, Sloan R., author

Kaynak, Hale, 1956-

Fyock, Catherine D., author

Runion, Meryl

Geraldi, Joana G., 1979- author

Wilson, Meena S., author

Maciariello, Joseph A., author

Kerkhof, Twan van de, author

Interview with Nora Pashayan, BSc MSc MSt MD PhD FFPH, author of Cost-effectiveness and Benefit-to-Harm Ratio of Risk-Stratified Screening for Breast Cancer: A Life-Table Model

This summary reviews a randomized clinical trial that explores the effect of the early introduction of solid foods on infant sleep.

Association of Early Introduction of Solids With Infant Sleep: A Secondary Analysis of a Randomized Clinical Trial

Interview with Brooke Nickel and Juan Brito, MD, MSc, authors of Effect of a Change in Papillary Thyroid Cancer Terminology on Anxiety Levels and Treatment Preferences: A Randomized Crossover Trial

Interview with Larry B. Goldstein, MD, author of Effect of Dextroamphetamine on Poststroke Motor Recovery: A Randomized Clinical Trial

Interview with Ananias C Diokno, MD, author of Effect of Group-Administered Behavioral Treatment on Urinary Incontinence in Older Women: A Randomized Clinical Trial

Interview with Magdalena Janecka, Ph.D., author of Association of Autism Spectrum Disorder With Prenatal Exposure to Medication Affecting Neurotransmitter Systems

Interview with Mikel Izquierdo, Ph.D, and Nicolás Martínez-Velilla, PhD, authors of Effect of Exercise Intervention on Functional Decline in Very Elderly Patients During Acute Hospitalization: A Randomized Clinical Trial, and William J. Hall, MD, author of A Novel Exercise Intervention and Functional Status in Very Elderly Patients During Acute Hospitalization

Interview with Guido Beldi, Consultant Surgeon, author of Effectiveness of Prophylactic Intraperitoneal Mesh Implantation for Prevention of Incisional Hernia in Patients Undergoing Open Abdominal Surgery: A Randomized Clinical Trial

Interview with Amanda H. Kerbrat, MSW, author of Effect of Augmenting Standard Care for Military Personnel With Brief Caring Text Messages for Suicide Prevention: A Randomized Clinical Trial

Interview with Pim Cuijpers, PhD, author of Effectiveness and Acceptability of Cognitive Behavior Therapy Delivery Formats in Adults With Depression: A Network Meta-analysis

Interview with Adrian F. Hernandez, MD, MHS, author of Clinical Effectiveness of Direct Oral Anticoagulants vs Warfarin in Older Patients With Atrial Fibrillation and Ischemic Stroke: Findings From the Patient-Centered Research Into Outcomes Stroke Patients Prefer and Effectiveness Research (PROSPER) Study

Interview with Kausik K. Ray, MD, author of Effect of 1 or 2 Doses of Inclisiran on Low-Density Lipoprotein Cholesterol Levels: One-Year Follow-up of the ORION-1 Randomized Clinical Trial, and Maarten JG. Leening, MD, PhD, author of Safety and Tolerability of Sustained Lipid-Lowering Therapy: Trial Data and Public Perception in a World Where Vaccines and Statins Are About to Collide

Interview with Katherine L. Possin, PhD, author of Effect of Collaborative Dementia Care via Telephone and Internet on Quality of Life, Caregiver Well-being, and Health Care Use: The Care Ecosystem Randomized Clinical Trial, and Jennifer Tjia, MD, MSCE, FAAHPM, author of A Telephone-Based Dementia Care Management Intervention—Finding the Time to Listen

Interview with Ranhjit Manchanda, MD, author of A Cost-effectiveness Analysis of Multigene Testing for All Patients With Breast Cancer

Interview with Sarah T. Arron, MD PhD, and Wesley Y Yu, MD, authors of Effect of Topical Brimonidine on Alcohol-Induced Flushing in Asian Individuals: A Randomized Clinical Trial

Interview with Charbel Moussa, MD, PhD, author of Nilotinib Effects on Safety, Tolerability, and Potential Biomarkers in Parkinson Disease: A Phase 2 Randomized Clinical Trial

Interview with James F. Howard, MD, author of Clinical Effects of Self-administered Subcutaneous Zilucoplan in Patients with Moderate to Severe Generalized Myasthenia Gravis: Results of a Phase 2 Randomized, Double-Blind, Placebo-Controlled, Multicenter Clinical Trial

Interview with Brad Spellberg, MD, author of Evaluation of a Paradigm Shift From Intravenous Antibiotics to Oral Step-Down Therapy for the Treatment of Infective Endocarditis: A Narrative Review

Interview with Mara A. Schonberg, MD, MPH, author of Effect of a Mammography Screening Decision Aid for Women 75 Years and Older: A Cluster Randomized Clinical Trial, and Quyen Ngo-Metzger, MD, MPH, author of The Life and Death of Mammograms in Patients 75 Years and Older—To Screen or Not to Screen?

The Minister also asked the States to ensure adoption of infection, prevention and control (IPC) practices in all health-care settings to avoid and reduce chances of infections to health-care workers.