css

html {
    height: 100%;
}

body {
  
    min-height: 100%;
    
    margin: 0;
    
    background-image: url("https://thrill.neocities.org/Background3.gif");
    
    background-size: cover;
    
    font-family: "Tahoma";
    
    color: orange;
    
    position: relative;

}

#container {

    position: relative; 

    height: 100%; 

    width: 100%; 

}

#logo1 {

    width: 150px; 

    height: auto; 

    position: absolute; 

    left: 8%; 

    top: 2px; 

    z-index: 2;

}

#logo1 img {

    width: 450px;

    height: 400px;

    min-height: 100px;


}

#sidebar {

    position: absolute; 
    
    background-color: #67005b;

    left: 10%; 

    top: 300; 

    border: 7px groove #a3f58e;

    height: 600px; 

    width: 300px; 

    padding: 15px;

    z-index: 1;

    overflow: auto;
}