<a href="#" class="kvadasa-knopku green ion-icecream"></a>
<a href="#" class="kvadasa-knopku blue ion-pizza"></a>
<a href="#" class="kvadasa-knopku navy ion-power"></a>
<a href="#" class="kvadasa-knopku yellow ion-mouse"></a>
<a href="#" class="kvadasa-knopku red ion-battery-full"></a>
<a href="#" class="kvadasa-knopku silver ion-battery-half"></a>

@import url(https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css);
.kvadasa-knopku {
  position: relative;
  font-size: 40px;
  background-color: #262626;
  color: #ffffff;
  width: 75px;
  margin: 40px;
  height: 75px;
  line-height: 75px;
  display: inline-block;
  text-align: center;
  border-radius: 4px;
  background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, 0.25) 0%, rgba(0, 0, 0, 0.1) 100%);
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.25) 0%, rgba(0, 0, 0, 0.1) 100%);
  box-shadow: inset 0px 1px 1px rgba(255, 255, 255, 0.2), inset 0px -1px 1px rgba(0, 0, 0, 0.5), 1px 1px 4px rgba(0, 0, 0, 0.5);
  text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.6);
  -webkit-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
  z-index: 1;
  -webkit-box-sizing: content-box;
  box-sizing: content-box;
}
.kvadasa-knopku:before {
  z-index: 2;
  opacity: 0.7;
}
.kvadasa-knopku:after {
  position: absolute;
  display: block;
  top: 0;
  height: 100%;
  width: 100%;
  background: #000000;
  content: '';
  border-radius: 50%;
  z-index: -1;
  background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.25) 100%);
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.25) 100%);
  box-shadow: inset 0px 1px 1px rgba(255, 255, 255, 0.2), inset 0px -1px 1px rgba(0, 0, 0, 0.5);
}
.kvadasa-knopku:before,
.kvadasa-knopku:after {
  -webkit-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}
.kvadasa-knopku:hover,
.kvadasa-knopku:focus,
.kvadasa-knopku.hover {
  text-shadow: 1px 3px 5px rgba(0, 0, 0, 0.8);
  color: #ffffff;
}
.kvadasa-knopku:hover:after,
.kvadasa-knopku:focus:after,
.kvadasa-knopku.hover:after {
  box-shadow: inset 0px 1px 1px rgba(255, 255, 255, 0.5), inset 0px -1px 1px rgba(0, 0, 0, 0.8);
}
.kvadasa-knopku:hover:before,
.kvadasa-knopku:focus:before,
.kvadasa-knopku.hover:before {
  opacity: 1;
}
.kvadasa-knopku:active {
  text-shadow: 2px 2px 2px rgba(0, 0, 0, 0.8);
  color: #ffffff;
}
.kvadasa-knopku:active:after {
  box-shadow: inset 0px -1px 1px rgba(255, 255, 255, 0.4), inset 0px 1px 1px rgba(0, 0, 0, 0.8);
}
.kvadasa-knopku.blue {
  background-color: #2980b9;
}
.kvadasa-knopku.blue:after {
  background-color: #2980b9;
}
.kvadasa-knopku.yellow {
  background-color: #f39c12;
}
.kvadasa-knopku.yellow:after {
  background-color: #f39c12;
}
.kvadasa-knopku.green {
  background-color: #27ae60;
}
.kvadasa-knopku.green:after {
  background-color: #27ae60;
}
.kvadasa-knopku.navy {
  background-color: #34495e;
}
.kvadasa-knopku.navy:after {
  background-color: #34495e;
}
.kvadasa-knopku.red {
  background-color: #c0392b;
}
.kvadasa-knopku.red:after {
  background-color: #c0392b;
}
.kvadasa-knopku.silver {
  background-color: #bdc3c7;
}
.kvadasa-knopku.silver:after {
  background-color: #bdc3c7;
}