#main-visual{
/*background: rgb(65,80,158);*/
background: linear-gradient(151deg, rgba(99, 154, 237) 0%, rgba(255, 233, 238, 1) 55%, rgb(190 171 226) 77%, rgb(249 136 180) 100%);
background-size: 200% 200%;/*サイズを大きくひきのばす*/
animation: bg-gradient 20s ease infinite;
}
@keyframes bg-gradient{
0% {
  background-position: 0% 50%;
}
50% {
  background-position: 100% 50%;
}
100% {
  background-position: 0% 50%;
}
}