.bp-login-selector .big {
width: 84px;
height: 84px;
}
.bp-login-button {
display: block;
float: left;
background-color: white;
background-repeat: no-repeat;
background-position: 50% 50%;
border: 1px solid black;
margin: 3px;
}

.bp-login-selector .small {
width: 16px;
height: 16px;
padding: 3px;
}