stylesheet.css

body {
    width: 100%;
}
#content, #nav {
    padding: 10px;
    margin: 10px;
}
#content {
    width: 70%;
    float: left;
    margin-left: 50px;
}
#nav {
    width: 20%;
    float: right;
    margin-right: 70px;
}
h1 {
    text-align: center;
}
#exercise {
    margin: 0 auto;
    margin-top: 20px;
    text-align: center;
}
#interface {
    width: 100%;
    margin: 0 auto;
    text-align: center;
}
h1 > a:hover {
    text-decoration: none;
}
.progress {
    margin-top: 10px;
    width: 70%;
    margin-left: 15%;
}
.link > a {
    text-decoration: none;
}
.link {
    margin-top: 10px;
}
.progress-bar {
    width: 0%;
}