<ul class="cp_list">
  <li>css</li>
  <li>html</li>
  <li>copy</li>
  <li>easy</li>
</ul>

ul.cp_list {
  padding:0;
  list-style-type:none;
}
ul.cp_list li {
  position:relative;
  padding: 0 0 0 20px;
}
ul.cp_list li::before,
ul.cp_list li::after {
  position: absolute;
  top: 0.3em;
  content: '';
  display: flex;
  justify-content: center;
  align-items: center;
  width: 13px;
  height: 15px;
  background: #4DD0E1;
}
ul.cp_list li::before {
  left: 0;
  border-radius: 3px;
}
ul.cp_list li::after {
  left: 8px;
  clip-path: polygon(0 0, 0% 100%, 100% 50%);
  transform: scale(0.5);
}