.pinlogin .pinlogin-field
{
    box-sizing:border-box;
    display:inline-block;
    width: 55px;
    height: 55px;
    font-size: 30px;
    padding: 5px;
    margin: 0 10px;
    border:1px solid #ccc;
    -webkit-border-radius:2px;
    -moz-border-radius:2px;
    border-radius: 2px;

    text-align:center;

}

.pinlogin .pinlogin-field:first-of-type {
    margin-left: 0;
}

.pinlogin .pinlogin-field:last-of-type {
    margin-right: 0;
}

.pinlogin .pinlogin-field:read-only
{
    border:1px solid #ddd;
    background:#fafafa;
    cursor:default;
}

.pinlogin .pinlogin-field.invalid
{
    border:1px solid red;
    color:red;
}