.ui-multiselect-header ul li {
    float: left;
    padding: 0px;
    position: relative;
    width: 45%;
}

.ui-multiselect-header li.ui-multiselect-close {
    float: right;
    text-align: right;
    padding-right: 0;
    width: auto;
}

.ui-multiselect-header span.ui-icon {
    float: left;
    margin: 0px;
}