a {
    text-decoration: none;
    color:dodgerblue;
}
a:hover{color:red}

body{
    background-image: url("picture/project_background.jpg");
    background-size: cover;
}

#intro{
    color: midnightblue;
    font-weight: bold;
    margin-left: 20px;
}

h2{
    cursor: pointer;
    margin-left: 10px;
}

#move{
    position: relative;
}

div#task {
    float:left;
    width: 30%;
}

div#topology{
    float:left;
}

#picture{
    display: none;
    margin-left: 38%;
}

#return{
    display: block;
    margin-left: 42%;
}