body{
    background-image: url("img/background_image.jpg");
    background-attachment: fixed;
    background-size: 100% 100%;
    overflow: hidden;

}
.regulamin{
    position: absolute;
    width:1000px;
    height:100%;
    text-align: center;
    top:0;
    background: rgba(100,0,150,.4);
    margin:auto;
    left:0;
    right:0;
    border-radius: 20px;
    color:white;
    font-family: cursive,arial,sans-serif;
}