#introduction>div[class="app"]{
    float: left;
    width: 100%;
    height:var(--h_title_app);
    text-align: center;
}
#introduction>div[class="app"]>a{
    height:var(--h_title_app);
    width:calc(3*var(--h_title_app) + 50px);
    display: inline-block;
    
    border:1px solid white;
	border-radius: 10px;
	-moz-border-radius: 10px;
	-webkit-border-radius: 10px;
    
    background-image: url(../../../../skin/appgoogle_long.png);
    background-repeat: no-repeat;
    background-size: auto 100%;
}
#introduction>div[class="app"]>a:first-child{
    background-image: url(../../../../skin/appstore_long.png);
    margin-right: 50px;
}
#introduction>div[class="app"]>a:hover{
    background-color: black;
}


@media (max-width: 800px) {

    #introduction>div[class="app"]>a{
        background-image: url(../../../../skin/appgoogle_short.png);
        width:var(--h_title_app);
    }
    #introduction>div[class="app"]>a:first-child{
        background-image: url(../../../../skin/appstore_short.png);
    }
}