*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,body{
  display: grid;
  height: 100%;
  place-items: center;
  background: url(/img/bgsdc.jpg);
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  
}
.center{
  display: flex;
  text-align: center;
  align-items: center;
  justify-content: center;
}
.outer{
  position: relative;
  margin: 0 50px;
  background: #111;
}

.circle{
  height: 200px;
  width: 200px;
  border-radius: 50%;
}
.outer button, .outer span{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.outer button{
  background: #111;
  color: #f2f2f2;
  outline: none;
  border: none;
  font-size: 20px;
  z-index: 9;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
}

.circle button{
  height: 180px;
  width: 180px;
  border-radius: 50%;
}
.outer span{
  height: 100%;
  width: 100%;
  background: inherit;
}

.circle span{
  border-radius: 50%;
}
.outer:hover span:nth-child(1){
  filter: blur(7px);
}
.outer:hover span:nth-child(2){
  filter: blur(14px);
}
.outer:hover{
  background: linear-gradient(#14ffe9, #ffeb3b, #ff00e0);
  animation: rotate 1.5s linear infinite;
}
@keyframes rotate {
  0%{
    filter: hue-rotate(0deg);
  }
  100%{
    filter: hue-rotate(360deg);
  }
}
@media (max-width: 640px){
  .center{
    flex-wrap: wrap;
    flex-direction: column;
  }
  .outer{
    margin: 50px 0;
  }
}