.desktop {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: #0a0a0a url(https://gambarimage.b-cdn.net/img/jktoto-wall.jpg);
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center center;
  background-size: cover;
  background-color: black;
}

.mobile {
  width: 100%;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: #0a0a0a url(https://gambarimage.b-cdn.net/img/jktoto-wall.jpg);
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center center;
  background-size: cover;
  background-color: black;
}
.button {
  background: linear-gradient(#ff0000, #690c2e, #fe0000);
  border: none;
  border-radius: 10px 10px 10px 10px;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  margin: 4px 2px;
  cursor: pointer;
  font-weight: bold;
}
.button1:hover {
  background: linear-gradient(#4dff00, #0d2906, #3ffe00);
  color: white;
  
}
@media screen and (max-width: 768px) {
  .desktop {
    display: none;
  }
  .mobile {
    display: flex;
  }
}