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

ul.cp_list {
  padding:0.5em;
  list-style-type:none;
}
ul.cp_list li {
  position:relative;
  padding: 0em 0.3em 0em 1.5em;
}
ul.cp_list li::before,
ul.cp_list li::after {
  position: absolute;
  content: '';
  display: flex;
  justify-content: center;
  align-items: center;
}
ul.cp_list li::after {
  top: 0.3em;
  left: 0em;
  width: 15px;
  height: 15px;
  background-color: #4DD0E1;
  border-radius: 25%;
}
ul.cp_list li::before {
  top: 0.45em;
  left: 0.8em;
  height: 0;
  width: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid #4DD0E1;
}