Animated buttons with rainbow hover.

Fast Go To Your>
Blogger Bashboard>>Theme>>Html

Now Add This CSS After </Style> OR ]]></b:skin>

@import url('https://fonts.googleapis.com/css?family=Nunito:400,600,700');

body{
  font-family: 'Nunito', sans-serif;
}

.a{color: #E7484F}
.b{color: #F68B1D}
.c{color: #FCED00}
.d{color: #009E4F}
.e{color: #00AAC3}
.f{color:  #732982}


.container{
  margin-top: 150px;
}

.text-center {
  text-align: center;
}

.rainbow{
  background-color: #343A40;
  border-radius: 4px;  
  color: #fff;
  cursor: pointer;
  padding: 8px 16px;
  
}

.rainbow-1:hover{
   background-image: linear-gradient(90deg, #00C0FF 0%, #FFCF00 49%, #FC4F4F 80%, #00C0FF 100%);
   animation:slidebg 5s linear infinite;
}

.rainbow-2:hover{
  background-image: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet, red);
  animation:slidebg 2s linear infinite;
}

.rainbow-3:hover{
  background-image: linear-gradient(to right, red, orange, yellow, green, blue, indigo, red);
  animation:slidebg 2s linear infinite;
}

.rainbow-4:hover{
   background-image:     linear-gradient(
      to right, 
      #E7484F,
      #F68B1D, 
      #FCED00,
      #009E4F,
      #00AAC3,
      #732982
    );
  animation:slidebg 2s linear infinite;
}


.rainbow-5:hover{
   background-image:     linear-gradient(
      to right, 
      #E7484F,
      #E7484F 16.65%,
      #F68B1D 16.65%,
      #F68B1D 33.3%,
      #FCED00 33.3%,
      #FCED00 49.95%,
      #009E4F 49.95%,
      #009E4F 66.6%,
      #00AAC3 66.6%,
      #00AAC3 83.25%,
      #732982 83.25%,
      #732982 100%,
      #E7484F 100%
     
     
     
    );
  animation:slidebg 2s linear infinite;
}


@keyframes slidebg {
  to {
    background-position:20vw;
  }
}

.follow{
  margin-top: 40px;
}

.follow a{
  color: black;
  padding: 8px 16px;
  text-decoration: none;
}

Now Save The Template.

Now Add This Html Where You Add This Button

  <a class="rainbow rainbow-1">Click Me!<a/>
  <a class="rainbow rainbow-2">Click Me!<a/>
  <a class="rainbow rainbow-3">Click Me!<a/>
  <a class="rainbow rainbow-4">Click Me!<a/>
  <a class="rainbow rainbow-5">Click Me!<a/>

DEMO