JSFiddle - React, Tailwind, and code Playground

by Sergey Goryachev

HTML

<div class="block">Подробнее</div>

CSS

body {
  background: url('http://www.2fons.ru/pic/201407/2560x1600/2fons.ru-39477.jpg') 50% 50% / cover no-repeat;
}
.block {
  width: 200px;
  height: 60px;
  line-height: 60px;
  text-align: center;
  border: 4px solid white;
  border-width: 4px 0 4px 0;
  margin-left: 50px;
  position: relative;
  font-family: Arial;
  font-size: 25px;
  font-weight: bold;
  color: white;
  text-transform: uppercase;
}
.block:before, .block:after {
  content: "";
  position: absolute;
  width: 34px;
  border: 4px solid white;
  transform: rotate(45deg) skew(15deg, 15deg);
  height: 34px;
}
.block:before {
  border-width: 0 0 4px 4px;
  left: -19px;
  top: 11px;
}
.block:after {
  border-width: 4px 4px 0 0;
  right: -19px;
  top: 11px;
}