#wp-admin-bar-wp-logo .ab-icon:before {
    content: '' !important;
}

#wpadminbar > #wp-toolbar > #wp-admin-bar-root-default > #wp-admin-bar-wp-logo .ab-icon {
    background-image: url('../images/imagecms-log.svg') !important;
    background-repeat: no-repeat;
    display: block;
    width: 20px;
    height: 20px;
    margin: 10px 0;
}