.container_video {
  position: relative;
  width: 100%;
  max-width: 400px;
}

.container_video img {
  width: 100%;
  height: auto;
}

.container_video .btn {
  position: absolute;
  top: 15%;
  left: 15%;
  transform: translate(-15%, -15%);
  -ms-transform: translate(-15%, -15%);
  background-color: #555;
  color: white;
  font-size: 12px;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
  border-radius: 5px;
  text-align: center;
}

.container_video .btn:hover {
  background-color: red;
}