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

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

body {
  font-family: "Roboto", sans-serif;
  background-color: #f5f5f5;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

.app {
  height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  overflow: hidden;
  position: relative;
}

.btn {
  width: 30%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 5%;
}

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

.btn a img {
  animation: scaleAnimation 1.5s infinite ease-in-out;
}

@media screen and (max-width: 768px) {
  .app {
    align-items: center;
  }

  .btn {
    width: 90%;
  }
}