body{
    margin: 0px;
    padding: 0px;
}

.main{
    background-image: url('../image/multicolors.jpg');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
    height: 100vh;

}
.content-img{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.content-img img{
    width: 900px;
}

/* ***** */
@media only screen and (max-width: 1400px){
    .content-img img{
        width: 850px;
    }
}

@media only screen and (max-width: 1200px){
    .content-img img{
        width: 800px;
    }
}

@media only screen and (max-width: 992px){
    .content-img img{
        width: 750px;
    }
}
@media only screen and (max-width: 800px){
    .content-img img{
        width: 700px;
    }
}
@media only screen and (max-width: 768px){
    .content-img img{
        width: 550px;
    }
}
@media only screen and (max-width: 576px){
    .content-img img{
        width: 450px;
    }
}
@media only screen and (max-width: 400px){
    .content-img img{
        width: 300px;
    }
}