html, body {
    height: 100%;
}
#wrapper {
    margin-right: auto;
    margin-left:  auto;
  
    max-width: 960px;
    height: 100%;
    
    padding-right: 10px;
    padding-left:  10px;
}

#indexfirstform {
    margin-top: 10%;
}

nav {
    margin-bottom: 5%;
}
nav, main {
    text-align: center;
    height: 100%;
}

h3 {
    margin-top: 10%;
}
ol {
    margin-right: auto;
    margin-left:  auto;
    text-align: left;
    max-width: 400px;
}

iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0; 
    left: 0;
}

.github-fork-ribbon::before { background-color: #333; }

.button-error {
    color: white;
    border-radius: 4px;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
    background: rgb(202, 60, 60);
}

#doublelink {
        background-color: #ed5a5a;
}
#videocontainer {
    position: relative; 
    padding-bottom: 56.25%; 
    padding-top: 30px; 
    height: 0; 
    overflow: hidden;
}

#link {
    display:inline;
}

hr {
    width: 50%;
    margin-top: 1%;
    margin-bottom: 1%;
}
#SpielID {
    display:inline;
}

#linkinfo {
    width: 50%;
    margin-right: auto;
    margin-left:  auto;
}

u:hover {
    cursor: pointer;
}
@media all and (max-width: 750px) {
    #linkinfo {
        width: 90%;
        margin-right: auto;
        margin-left:  auto;
    }
    }

#SpielID{
    margin: 0;
    text-transform: uppercase;
}

.collapsible {
    background-color: #777;
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
  }
  
.active, .collapsible:hover {
    background-color: #555;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: #f1f1f1;
}

canvas {
    position: absolute;
    left: 50%;/* move the canvas horizontally to the center */
    top: 10%;
    transform: translateX(-50%); /* adjust the horizontal position to center the canvas */
    pointer-events:none;
}