index.css

html, body {
    max-width: 100%;
    overflow-x: hidden;
    color:#fff;
    /* 方案1：背景图和元素对位，但不保证填充窗口 */
    /* background: #22132f url(images/bg.png) no-repeat bottom center;
    background-size: 100% 100%; */

    /* 方案2：背景图填充窗口，但无法和元素对位 */
    background: #22132f url(images/bg.png);
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 50%;
}
.main {
    padding: 0;
}

.page-header {
    color: #fff;
    /*height: 48px;*/
    background: #1D88E6;
    /*border-bottom: 1px solid #1783DB !important;*/
}

.main-color {
    background-color: #1D88E6 !important; 
}

.page-header .pui-menubar {
    margin: 0;
}

.page-header .fa {
    color: #fff;
    padding: 0;
    -webkit-transition: color 0.2s ease-in;
    transition: color 0.2s ease-in;
}

.page-header .fa.hover,
html.no-touch .page-header .fa:hover {
    color: rgba(0, 0, 0, .3);
}

.page-header .fa-list {
    padding-top: 12px;
}

.page-header .pui-menu-simple {
    padding-top: 6px;
}

.page-header .pui-menu-simple.open {
    width: 100%;
    background: #1D88E6;
    top: 4.7rem;
    right: 0;
    display: block;
    float: none !important;
    padding: 2rem 0;
    text-align: center;
}

.page-header .pui-menu-simple.open > li {
    display: inline-block;
}

.page-header .pui-menu-simple.pui-menu-inline > li > a {
    color: #fff;
    padding: 1px 10px;
}

.page-header .pui-menu-simple.pui-menu-inline > li > a.hover,
html.no-touch .page-header .pui-menu-simple.pui-menu-inline > li > a:hover {
    color: #fff;
    background-color: rgba(0, 0, 0, .3);
    border-radius: 500px;
}

[class*=pui-grid-] {
    margin-bottom: 25px;
}

.pui-row {
    padding-bottom: 3rem;
}

.banner {
    display: table;
    margin-bottom: 50px;
    background: #1D88E6 url(dist/images/bg.jpg) no-repeat bottom center;
    background-size: contain;
}

.banner-con {
    color: #fff;
    display: table-cell;
    padding: 210px 0;
    vertical-align: middle;
    text-align: center;
}

.banner-con > h1.pui-text-xxxxxl {
    line-height: 1.2;
}

.pui-row {
    margin-bottom: 0;
}

.page-title > .fa {
    margin-top: -5px;
}

#mobile-first {
    margin-top: 0.6rem;
}

.features p {
    padding-left: 3rem;
    padding-right: 3rem;
}

footer {
    margin-bottom: 3rem;
}

#go-to-top {
    position: fixed;
    bottom: 10%;
    right: 10%;
    z-index: 999;
    display: none;
    -webkit-transition: all 300ms ease-out;
    transition: all 300ms ease-out;
}

#go-to-top.hover,
html.no-touch #go-to-top:hover {
    color: #2989D6 !important;
}

@media (max-width: 320px) {
    
    .features h1 {
        zoom: 1;
    }
    
    .pui-grid-xs-6 {
        width: 100%;
    }
}

@media (max-width: 360px) {
    .banner-con {
    }

    .fa.fa-3x {
        font-size: 8rem;
    }
}

@media (max-width: 480px) {   
    .banner-con {
        padding: 120px 0;
    }
    
    .features p {
        padding-left: 0;
        padding-right: 0;
    }
    
    .features h1, .examples h1 {
        zoom: 0.7;
    }
    
    .features h5, .examples h5 {
        font-size: 1.6rem;
    }
    
    #mobile-first {
        margin: 0 0 12px !important;
    }
}

@media only screen and (max-width: 640px) {
    .banner-con {
        padding: 120px 0;
    }

    .banner-con > h1 {
        line-height: 1.2;
        padding-left: 3rem;
        padding-right: 3rem;
        font-size: 2.4rem !important;
    }

    .banner-con > h1.pui-text-xxxxxl {
        font-size: 4rem  !important;
        margin-bottom: 1.2rem  !important;
    }

    .banner-con > .pui-text-lg {
        line-height: 1.2;
        font-size: 1.2rem  !important;
        padding-left: 3rem;
        padding-right: 3rem;
    }
}

@media only screen and (max-width: 639px) {

    .page-header .pui-menu-simple {
        display: none;
    }
    .pui-menubar {
        padding-top:15px;
    }
    
    #go-to-top {
        font-size: 2.5em;
    }
}

@media (min-width: 481px) and (max-width:768px), (min-width:769px) and (max-width: 870px)  {
    #mobile-first {
        /*zoom: 0.8 !important;*/
        margin: 15px 0 24px !important;
        display: block !important;
    }
    
    #mobile-first a {
        font-size: 99% !important;
    }
}

@media (max-width: 1024px) {
    /*.page-title {
        padding: 0 15px;
    }*/
    .pui-menubar {
        padding-left: 25px;
        padding-right: 25px;
    }

    footer {
        padding: 25px 30px;

    }
    
    .main-con {
        padding-left: 3rem;
        padding-right: 3rem;
    }

    .main {
        padding-bottom: 0;
    }
}

@media only screen and (-webkit-min-device-pixel-ratio: 2) {
    .banner {
        background-image: url(./login/images/bg@2x.jpg);
    }
}

@media only screen and (-webkit-min-device-pixel-ratio: 3) {
    .banner {
        background-image: url(./login/images/bg@2x.jpg);
    }
}

.fa-paper-plane {

}

.pui-row > h2 {
    margin-bottom: 3rem;
}

.pui-hr-dashed {
    margin-bottom: 5rem;
}

h5 {
    font-weight: normal;
    font-size: 2rem;
}

.pui-text-num {
    color:#fff;
    font-size: 30rem !important;
}
.temp{
    /* display: table-cell; */
    padding-top: 30%;
    /* width: 80%; */
    vertical-align: middle;
    text-align: center;
}

.copyright{
    color:#8d7b7b;
    float: right;
}
.pui-img-lefttop{
    margin-left: 1%;
    margin-top: 1%;
    width: 10%;
    float: left;
}