.section {
    min-height: 660px;
    min-height: 100vh;
    overflow:hidden;
}

.container-fluid {
    
}

.logo-app img {
    display: block;
    width: 80px;
    height: 80px;
   
}
.link-app i{
    font-size:12px;
    color:#000;
   font-style:normal;
}
.title {
    position: absolute;
    top: 8px;
    left: 96px;
    text-align: left;
}

    .title a {
        display: block;
        color: rgba(0,0,0,.87);
    }

.title-app {
    font-weight: bold;
    font-size: 24px;
}

.logo-app {
    display: block;
    margin-bottom: 16px;
}

.left {
    float: left;
    width: 300px;
    text-align: center;
    display: block;
    margin-top: 200px;
    position: relative;
}
.link-app a:hover{
    opacity:0.8;
}
.logo-left {
    position: relative;
}

.right {
    right: 0;
    position: absolute;
    width: 50%;
    top: 75px;
   height:auto;
}

.link-app .link {
    width: 50%;
    float: left;
    height: auto;
    display: inline-block;
}
#mamnon .right{
    width:60%;
}
#toan1 .right {
    width: 60%;
    top:148px;
}
#toan .right {
    top: 115px;
    width:60%;
}
#toan2 .right {
    top: 162px;
}

.section {
    background: url(images/bg_container.jpg) top center no-repeat fixed;
    width: 100%;
    background-size: cover;
    position: relative;
}
    .section:nth-child(2n) {
        background: #f9f9fa;
    }
#toan1 {
    background: url(images/bg_container1.jpg) top center no-repeat fixed;
    width: 100%;
    background-size: cover;
    position: relative;
}
#mamnon {
    background: url(images/bg_container2.jpg) top center no-repeat fixed;
    width: 100%;
    background-size: cover;
    position: relative;
}
    #mamnon a, #mamnon i {
        color: #fff;
    }
    #giaibaitap {
        background: url(images/bg_container1.jpg) top center no-repeat fixed;
        width: 100%;
        background-size: cover;
        position: relative;
    }
    #giaibaitap .right{
        width:37%;
    }

    @media all and (max-width: 960px) {
        #toan2 .container{
        padding-bottom:0;
    }
        #toan .right{
            width:100%;
        }
        #mamnon .right {
            width: 100%;
        }

        #toan1 .right {
            width: 100%;
        }
        #giaibaitap .right{
            width:100%;
        }
        .right {
            position: static;
            max-width: 450px;
            margin: 0 auto;
            width: inherit;
            height: inherit;
        }
        .left {
            float: none;
            margin: 67px auto 16px auto;
            max-width: 300px;
            width: inherit;
        }
        #giaibaitap .left, #hoctienganh .left{
            margin-top:51px;
        }
    .phone img {
        max-width: 100%;
        max-height: 100%;
        display: block;
        margin: 0 auto;
    }
        .section {
            min-height: 635px;
            min-height:100vh;
        }
       
        
    }
@media all and (max-width: 375px) {
    #toan2 .right {
        margin-top: 65px;
    }
}