html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  overflow: hidden;
}
a.hit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: #000 center / contain no-repeat;
  text-decoration: none;
}
.btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  border: 2px solid #fff;
  position: relative;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}
.btn::after {
  content: "";
  position: absolute;
  left: 28px;
  top: 22px;
  border: 14px solid transparent;
  border-left: 22px solid #fff;
}
a.hit:hover .btn {
  background: rgba(200, 0, 0, 0.75);
}