div.medya_cerceve
{
float:left;
width:100%;
height:auto;
}

div.medya
{
position:relative;
width:100%;
padding-bottom:35%;
}

div.medya iframe
{
position: absolute;
z-index:81;
top:0;
bottom:0;
left:0;
width:100%;
height:100%;
}

@media (max-width:768px)
{
div.medya
{
position:relative;
width:100%;
padding-bottom:70%;
}
}