/* General Buttons */
.holder button {
  width: 130px;
  height: 40px;
  background: linear-gradient(to bottom, #4eb5e5 0%,#389ed5 100%); /* W3C */
  border: none;
  border-radius: 5px;
  position: relative;
  border-bottom: 4px solid #2b8bc6;
  color: #fbfbfb;
  font-weight: 600;
  font-family: 'Open Sans', sans-serif;
  text-shadow: 1px 1px 1px rgba(0,0,0,.4);
  font-size: 18px;
  text-align: left;
  text-indent: 5px;
  box-shadow: 0px 3px 0px 0px rgba(0,0,0,.2);
  cursor: pointer;

/* Just for presentation */  
  display: block;
  margin: 0 auto;
  margin-bottom: 20px;
}
.holder button:active {
  box-shadow: 0px 2px 0px 0px rgba(0,0,0,.2);
  top: 1px;
}

.holder button:after {
  content: "";
  width: 0;
  height: 0;
  display: block;
  border-top: 20px solid #187dbc;
  border-bottom: 20px solid #187dbc;
  border-left: 16px solid transparent;
  border-right: 20px solid #187dbc;
  position: absolute;
  opacity: 0.6; 
  right: 0;
  top: 0;
  border-radius: 0 5px 5px 0;  
}

/* Button pointing left */

.holder button.back {
  text-align: right;
  padding-right: 12px;
  box-sizing: border-box;
}
.holder button.back:after {
  content: "";
  width: 0;
  height: 0;
  display: block;
  border-top: 20px solid #187dbc;
  border-bottom: 20px solid #187dbc;
  border-right: 16px solid transparent;
  border-left: 20px solid #187dbc;
  position: absolute;
  opacity: 0.6; 
  left: 0;
  top: 0;
  border-radius: 5px 0 0 5px;    
}

/* Single buttons */

.holder button.site {
  width: 40px;
  text-align: center;
  text-indent: 0;
}
.holder button.site:after{
  display: none;
}