<div class="container">
  <input id="checkbox" type="checkbox"/>
  <label for="checkbox" ></label>
</div>

:root {
  font-size: 100px;
  --blue: #0074D9;
  --darkblue: #005FB2;
}

body {
  background: #111111;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

input[type = checkbox] {
  display: none;
}

input + label {
  font-size: 1.2rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border: .1rem solid var(--blue);
  border-radius: 50%;
  background: var(--darkblue);
  transition: .1s all;
  cursor: pointer;
  z-index: 999 !important;
}

input + label:hover {
  transform: scale(.95);
}

input + label:after {
  content: "🤜";
}

input:checked + label {
  background: var(--blue);
  transform: scale(1.1);
}

input:checked + label:hover {
  background: var(--blue);
  transform: scale(1.05);
}

input:checked + label:after {
  content: "👍";
}