JSFiddle - React, Tailwind, and code Playground

by krish reddy

HTML

<p class="triangle-border left">But it could be any element you want.</p>

CSS

.triangle-border.left{
    margin-left: 30px;
}
.triangle-border {
  position:relative;
  padding:15px;
  margin:1em 0 3em;
  border:1px solid #49c8ff;
  color:#333;
  background:#fff;
  /* css3 */
  -webkit-border-radius:10px;
  -moz-border-radius:10px;
  border-radius:10px;
}
.triangle-border.left:before {
  top:10px; /* controls vertical position */
  bottom:auto;
  left:-30px; /* value = - border-left-width - border-right-width */
  border-width:15px 30px 15px 0;
  border-color:transparent #49c8ff;
}

/* creates the smaller  triangle */
.triangle-border.left:after {
  top:16px; /* value = (:before top) + (:before border-top) - (:after border-top) */
  bottom:auto;
  left:-21px; /* value = - border-left-width - border-right-width */
  border-width:9px 21px 9px 0;
  border-color:transparent #fff;
}
.triangle-border:before {
  content:"";
  position:absolute;
  bottom:-20px; /* value = - border-top-width - border-bottom-width */
  left:40px; /* controls horizontal position */
  border-width:20px 20px 0;
  border-style:solid;
  border-color:#49c8ff transparent;
  /* reduce the damage in FF3.0 */
  display:block;
  width:0;
}

/* creates the smaller  triangle */
.triangle-border:after {
  content:"";
  position:absolute;
  bottom:-13px; /* value = - border-top-width - border-bottom-width */
  left:47px; /* value = (:before left) + (:before border-left) - (:after border-left) */
  border-width:13px 13px 0;
  border-style:solid;
  border-color:#fff transparent;
  /* reduce the damage in FF3.0 */
  display:block;
  width:0;
}