html, body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: #000;
  font-family: Arial, Helvetica, sans-serif;
}

.start-screen {
  width: 100%;
  height: 100%;
  position: relative;

  background-image: url("assets/Background.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.start-btn {
  position: absolute;
  left: 50%;
  bottom: 10%;
  transform: translateX(-50%);

  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  outline: none;
}

.start-btn-img {
  display: block;
  width: 360px;
  height: auto;
}

.start-btn:focus .start-btn-img {
  transform: scale(1.03);
  filter: drop-shadow(0 0 14px rgba(255,255,255,0.55));
}

.start-btn:active .start-btn-img {
  transform: scale(0.99);
}