body {
    background-color: rgb(152, 202, 249);
  }
  
.sidebar {
margin: 0;
padding: 0;
width: 200px;
background-color: #f1f1f1;
position: fixed;
height: 100%;
overflow: auto;
}

.sidebar a {
display: block;
color: black;
padding: 16px;
text-decoration: none;
}

.sidebar a.active {
background-color: rgb(52, 115, 250);
color: white;
}

.sidebar a:hover:not(.active) {
background-color: #555;
color: white;
}

div.content {
margin-left: 200px;
padding: 1px 16px;
height: 1000px;
}

@media screen and (max-width: 700px) {
.sidebar {
    width: 100%;
    height: auto;
    position: relative;
}
.sidebar a {float: left;}
div.content {margin-left: 0;}
}

@media screen and (max-width: 400px) {
.sidebar a {
    text-align: center;
    float: none;
}
}