layui-ul/source/scss/jumbotron/_jumbotron_left.scss

.ul-jumbotron {
    &.left {
        .main {
            text-align : left;
            max-width  : auto;
            margin-left: 30px;

            .desc {
                margin: 25px auto 25px 0;
            }
        }
    }

}