body
{
    background-size: 100%;
    background-repeat:repeat-y;
}

.header{
    background-image: url("../img/logo_poziom.png");
    background-repeat:no-repeat;
    height:100px;
    width: 98%;
    margin-bottom:50px;
}

.button{
    max-width:300px;
    margin:10px auto 10px auto;
}

.box{
    text-align:center;
    display:none;
}

.header{
    background-color: rgba(255, 255, 255, 0.33)
}

.back{
   margin-top: 30px;
   color: white;
}