html,
body {
    height: 100vh;
    overflow: hidden;
}

body {
    background-image: url(../images/bg.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-color: #464646; position: relative;
}

.mainContent {
   
    margin: 40px;
    border-top: 3px solid #FFF;
    border-left: 3px solid #FFF;
    border-right: 3px solid #FFF;
    border-radius: 5px;
    padding: 40px;
    height: calc(100vh - 160px);    padding-bottom: 5px;
}
.posAbs{
    position: absolute;
    content: '';
    bottom: -36px;
    left: -2px;
    width: 100%;
    max-width: 100%!important;
}
 .mainContent:before{
    background-image: url(../images/bottomFooter.png);
    background-repeat: no-repeat;
    position: absolute;
    content: '';
    bottom: 19px;
    left: 40px;
    width: calc(100% - 80px);
    float: left!important;
    max-width: 100%!important;
    display: block;
    background-size: 100% auto;
    height: 84px;
} 
.mainContent > img {
    float: right;
    max-width: 300px;
}
.bottomFooter{
    position: absolute;
    content: '';
    left: 0;
    bottom: -20px;
    width: 100%;
    text-align: left;
}
.bottomFooter img {
    width: 300px;
}
.bottomFooter img + img{
    float: right;
}
.hiddenDesktop{
    display: none;
}
@media all and (max-width: 1450px){
    .mainContent:before {
        bottom: 15px;background-size: contain;
    }
}
@media all and (max-width: 1350px){
    .mainContent:before {
        bottom: 10px;
    }
} 
@media all and (max-width: 950px){
    .mainContent:before {
       display: none;
    }
    .mainContent {
        border-bottom: 3px solid #FFF;
        position: relative;
    }
    .mainContent > img {
        float: right;
        max-width: 200px;
    }
    .hiddenDesktop{
        display: block;
        position: absolute;
        bottom: 20px;
        width: 100%;
    }
    .hiddenDesktop  img{
        max-width: 200px; display: block;
        margin-bottom: 20px;
    }
} 
@media all and (max-width: 950px){
    .mainContent:before {
        bottom: 5px;
    }
}