body {
    background-image: url('');
    background-size: cover;
    background-repeat:no-repeat;
}
@media(max-width:500px)
{
    body,html
    {
        height:unset;
    }
}

.mainLogo
{
    height:150px;
    background-size:contain;
    background-repeat:no-repeat;
    background-position:center center;

}