.btn Call to action
  .btn2

body
  background #f5f5f5
  display flex
  justify-content center
  align-items center
  width 100vw
  height 100vh
  .btn, .btn2
     width 300px
     height 100px
     font-size 30px
     text-align center
     line-height 100px
     color rgba(255,255,255,0.9)
     border-radius 50px
     background linear-gradient(-45deg, #FFA63D, #FF3D77, #338AFF, #3CF0C5)
     background-size 600%
     animation anime 16s linear infinite
  .btn2
     position absolute
     margin-top -70px
     z-index -1
     filter blur(30px)
     opacity 0.8
     
 @keyframes anime 
   0%
     background-position 0% 50%
   50%
     background-position 100% 50%
   100%
     background-position 0% 50%