.error-form .panel-body
{
    min-height: 300px;
    background-image: url("{$themespath}/images/error-404.jpg");
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100%;
}

.error-form .panel-body h3
{
    text-align: center;
    font-size:18px;
    color:red;
    font-weight: bolder;
}