create a border with top triangle in css

create a border with top triangle in css Demo

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create a border with top triangle in css Code

HTML

<div class="container">Border with top triangle</div>

CSS

.container {
  position: relative;
  background: #ffffff;
  padding: 15px;
  border: 1px solid #dddddd;
  margin-top: 20px;
  color:#444;
}

.container:before,
.container:after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 19px;
  border: 11px solid transparent;
  border-bottom-color: #dddddd;
}

.container:after {
  left: 20px;
  border: 10px solid transparent;
  border-bottom-color: #ffffff;
}