* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

a {
  text-decoration: none;
  color: #000;
}

body {
  font-family: "Roboto", sans-serif;
  background-color: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

/* Bao ngoài */
.app {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

video {
  cursor: pointer;
  height: 100%;
}

@keyframes scaleAnimation {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

@media screen and (max-width: 768px) {
  .btn {
    width: 90%;
  }
}