#bar {
    background-color: #0bd;
    position: fixed;
    top: 0;
    left: 0;
    height: 10px;
    /* width: 100%; */
}
#bar2 {
    background-color: #0bd;
    position: fixed;
    top: 0;
    right: 0;
    width: 10px;
}   
#bar3 {
    background-color: #0bd;
    position: fixed;
    bottom: 0;
    right: 0;
    height: 10px;
}
#bar4 {
    background-color: #0bd;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 10px;
}

#bar5 {
    background-color: rgb(0, 221, 177);
    opacity: 0.2;
    position: fixed;
    top: 0;
    left: 0;
    height: 50%;
}
#bar6 {
    background-color: rgb(0, 221, 177);
    opacity: 0.2;
    position: fixed;
    bottom: 0;
    right: 0;
    height: 50%;
}


article {
    max-width: 800px;
    margin: auto;
    padding: 2rem;
    line-height: 1.8;
}
h2 {
    margin: 2rem 0 1rem;
}