@media screen and (min-width: 900px) 
{
    h1
    {
        #font-size:90%; 
    }
    .menu_label
    {
        margin-left: 5px; 
        margin-right: 5px; 
        margin-bottom: 0px; 
        margin-bottom: 0px; 
    }
    
    #logo
    {
        display:inline-block;
    }
    
    #title_site
    {
        font-size:550%; 
        font-family:'Tangerine';
    }
    #prices
    {
        font-size:90%; 
    }
}

@media screen and (max-width: 900px) 
{
    h1
    {
        font-size:140%; 
    }
    .menu_label
    {
        margin-left: 5px; 
        margin-right: 5px; 
        margin-bottom: 5px; 
        margin-bottom: 5px; 
        font-size : 120%;
    }
    #logo
    {
        display:none;
    }
    #logo_div
    {
        display:none;
    }
    #title_site
    {
        font-size:120%; 
        font-family:verdana;
    }
    #prices
    {
        font-size:130%; 
    }
}