styles.css

* {
        margin: 0;
        padding: 0;
        /* border: 0; */
        outline: 0;
        font-size: 100%;
        vertical-align: baseline;
        background: transparent;
    }

.header {
    width:100%;
    height: 20px;
    padding: 20px;
    background-color: #405984;
    color: #131b27;
    font-family: Georgia, serif;
    font-size: 25px;
    margin-top: -8px;
    margin-left: -8px;
    vertical-align: middle;
    transition: margin-left 0.5s;

}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #f2f2f2;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #808080;
    display: block;
    transition: 0.3s;
}

.sidenav a:hover {
    color: #111;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 25px;
    margin-left: 50px;
}

.toolbar {
  height: 300px;
  width: 150px;
  float:left;
}

.main {
    width: 100%;
    outline: none;
    resize: none;
}

footer {
    width: 100%;
    padding: 50px;
    left: 0;
    bottom: 0;
    background-color: #f2f2f2;
    color: #808080;
    font-size: 25px;
    color: #808080;
}