.char-field{
width: 45px;
height: 45px;
background: rgba(0,0,0,.5);
border: 1px solid transparent;
color: #fff;
border-radius: 6px;
outline: none;
margin: 1px;
line-height: 30px;
padding-top: 0;
padding-bottom: 0;
box-shadow: none;
-webkit-box-shadow: none;
-moz-box-shadow: none;
font-weight: normal;
font-size: 21px;
text-align: center;    
}