はてなブログのフォローボタン。コピペ用CSS。

follow-button.css

.display-none {
  display: none !important;
}
.follow-buttons {
  display: flex;
  justify-content: space-around;
  align-items: center;
  position: relative;
  width: 100%;
}
.follow-buttons .follow-button {
  position: relative;
  width: 25%;
  max-width: 65px;
  min-width: 54px;
}
.follow-buttons .follow-button:before {
  padding-top: 100%;
  display: block;
  content: "";
}
.follow-buttons .follow-button-inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 2px solid #7f7f7f;
  border-radius: 50%;
  transition: all 0.4s ease;
  cursor: pointer;
}
.follow-buttons .follow-button-inner .icon {
  font-size: 32px;
}
.follow-buttons .follow-button-inner-blog {
  border-color: #78909c;
  color: #78909c;
  background-color: #ffffff;
}
.follow-buttons .follow-button-inner-blog:hover {
  background-color: #78909c;
  color: #ffffff;
}
.follow-buttons .follow-button-inner-twitter {
  border-color: #29b6f6;
  color: #29b6f6;
  background-color: #ffffff;
}
.follow-buttons .follow-button-inner-twitter:hover {
  background-color: #29b6f6;
  color: #ffffff;
}
.follow-buttons .follow-button-inner-github {
  border-color: #B083DF;
  color: #B083DF;
  background-color: #ffffff;
}
.follow-buttons .follow-button-inner-github:hover {
  background-color: #B083DF;
  color: #ffffff;
}
.follow-buttons .follow-button-inner-feedly {
  border-color: #66bb6a;
  color: #66bb6a;
  background-color: #ffffff;
}
.follow-buttons .follow-button-inner-feedly:hover {
  background-color: #66bb6a;
  color: #ffffff;
}
.follow-buttons .follow-button-inner .tooltip {
  display: none;
  position: absolute;
  width: 100px;
  left: 50%;
  top: 110%;
  opacity: 0;
  background-color: #263238;
  color: #ffffff;
  font-size: 0.6rem;
  text-align: center;
  border-radius: 4px;
  padding: 6px;
  -webkit-transform: translate(-50%, 0);
  -moz-transform: translate(-50%, 0);
  -ms-transform: translate(-50%, 0);
  -o-transform: translate(-50%, 0);
  transform: translate(-50%, 0);
}
.follow-buttons .follow-button-inner:hover .tooltip {
  display: block;
  animation-name: fade-in;
  -moz-animation-name: fade-in;
  -webkit-animation-name: fade-in;
  animation-duration: 0.4s;
  animation-delay: 0.4s;
  -moz-animation-duration: 0.4s;
  -moz-animation-delay: 0.4s;
  -webkit-animation-duration: 0.4s;
  -webkit-animation-delay: 0.4s;
  animation-fill-mode: forwards;
  -moz-animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}
@keyframes fade-in {
  0% {
    display: none;
    opacity: 0;
  }
  1% {
    display: block;
    opacity: 0;
  }
  100% {
    display: block;
    opacity: 1;
  }
}
@-moz-keyframes fade-in {
  0% {
    display: none;
    opacity: 0;
  }
  1% {
    display: block;
    opacity: 0;
  }
  100% {
    display: block;
    opacity: 1;
  }
}
@-webkit-keyframes fade-in {
  0% {
    display: none;
    opacity: 0;
  }
  1% {
    display: block;
    opacity: 0;
  }
}