span{
    font-size: 50px;
}
div {
    opacity: 0.5;
}
a{
    font-size: 25px;
}
body {
    background-image: url("Obrázky/tumblr_7f5b5b26abf48a8a6d785566142dd157_4ef6daae_400.gif");
    background-repeat: no-repeat;
    background-size: cover;
}
.pinktext {
    color: deeppink;
}
.iframestyle {
    height: 100%;
    width: 100%;
    opacity: 1;
    border: hidden;
}
.zahlavi {
    width: 100%;
    background-color: aqua;
    height: 50px;
    text-align: center;
    font-size: 40px;
    margin-left: auto;
    margin-right: auto;
}
.clanek {
    box-sizing: border-box;
    width: 100%;
    height: 800px;
    margin: 20px 0;
    padding: 15px;
    background-color: aqua;
    opacity: 0.7;
}
@media screen and (min-width: 900px) {
    .clanek {
        width: 79%;
        float: left;
    }
}
.postrannipanel {
    box-sizing: border-box;
    width: 100%;
    height: 400px;
    margin: 20px 0;
    padding: 10px;
    background-color: aqua;
}
@media screen and (min-width: 900px) {
    .postrannipanel {
        width: 19%;
        float: right;
    }
}