.boxhead a {
    color: #FFFFFF;
    text-decoration: none;
}

.outer {
  display: table;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}

.middle {
  display: table-cell;
  vertical-align: middle;
}

.inner {
  margin-left: auto;
  margin-right: auto;
  width: 400px;
  /* Whatever width you want */
}

.back {
font-size: 15px; 
float: left; 
background-color: #5A5A5A;  
color: #ffffff; 
margin: 0px; 
padding: 7px;  
}


.next {
font-size: 15px; 
float: right; 
background-color: #5A5A5A;  
color: #ffffff; 
margin: 0px; 
padding: 7px;  
}