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

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

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

.app {
  background: url(images/bg.webp);
  background-size: 100% 100%;
  background-position: center bottom;
  height: 100vh;
  max-width: 450px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  padding: 0.5%;
}

.app--mb {
  background: url(images/bg-main.webp);
  background-size: 100% 100%;
  background-position: center bottom;
  height: 100vh;
  max-width: 450px;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  overflow: hidden;
}

.app--mb .content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 10%;
  padding: 10% 2%;
  height: 100%;
}

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

.btn {
  width: 90%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

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

@media screen and (max-width: 768px) {
  .btn {
    gap: 5px;
  }

  .app .content {
    width: 95%;
  }
}