.headBG
{
    display:block;
}
.headBG2
{
    display:none;
}
@media screen and (max-width: 736px)
{
    .headBG
    {
        display:none;
    }
    .headBG2
    {
        display:block;
        margin-top:22px;
    }
    .headMountain
    {
        margin-top:0;
    }
}