h1 {
    margin-top: 0;
}
body {
    padding: 30px;
    height: 90vh;
}
#post-container {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 60%;
    padding: 20px;
    height: calc(100% - 40px);
    overflow-y: scroll;
}
.post {
    padding: 10px;
    box-shadow: 1px 1px 3px 2px;
    margin: 20px;
}