[class*="logoD"]{
  border: 0;
  text-decoration: none;
  text-transform: uppercase;
  font-weight: 400;
  color: #777;
  outline: 0;
  display: inline-block;
  background: url(../../../images/D2.png) 0.3em 0.3em;
  background-size: 1.2em;
  background-repeat: no-repeat;
  width: 1.65em;
  height: 1.65em;
  margin-right: 5em;
  border-radius: 1.65em;
  line-height: 1.65em;
  text-align: center;
  box-shadow: 0.125em 0.175em 0 0 rgba(0, 0, 0, 0.125);
  -moz-transition: color 0.25s ease-in-out, background 0.25s ease-in-out;
  -webkit-transition: color 0.25s ease-in-out, background 0.25s ease-in-out;
  -o-transition: color 0.25s ease-in-out, background 0.25s ease-in-out;
  -ms-transition: color 0.25s ease-in-out, background 0.25s ease-in-out;
  transition: color 0.25s ease-in-out, background 0.25s ease-in-out;
}

.logoD:hover{
  background: url(../../../images/D3.jpg) 0.3em 0.3em;
  background-size: 1.2em;
  background-repeat: no-repeat;
}