body {
    background-color: black;
    margin: 0;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 200px;
    background-color: #333;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    overflow-y: auto;
}

nav li {
    border-top: none;
}

nav li.start a {
    border-top: 3px solid white;
}

nav li a {
    display: block;
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    margin-top: 5px;
}

nav li a:hover {
    background-color: red;
}

.cs1 {
    margin-left: 220px;
    padding: 20px;
}

.cs {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    margin-left: 220px;
    padding: 20px;
}


.container {
    display: flex;
    flex-direction: column; 
}

/* Reihen */
.row {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
}

.box {
    width: 200px;
    height: 200px;
    border: 2px solid red;
    margin: 5px;
}


.cs1 h1 {
    color: white; 
}

.notification-icon {
    position: fixed;
    top: 10px;
    right: 10px;
	width:50px;
    
}