layout.css

body {
    background-image: url("https://selab.hanyang.ac.kr/courses/cse326/2019/labs/images/3/blueTextureBG.jpg");
}

#container {
    margin: 0 10%;
}

article {
    float: right;
    width: calc(85% - 50px);
}

#content {
    border: 10px solid white;
    background: white;
    overflow: hidden;
}    

#title {
    background: #1D2475;
    color: white;
    text-align: right;
}

#title h2 {
    font-size: 14pt;
    color: #cccccc;
}

#cars, #sports, #music {
    border: 4px solid #1D2475;
    border-radius: 15px;
    background: #99CCFF;
    padding: 5px;
    margin-top: 10px;
    overflow: hidden;
}

.things {
    border-bottom: 2px dashed blue;
}

.image {
    float: right;
}

.text {
    text-align: justify;
}

sidebar {
    background-color: #3366CC;
    border: 4px solid #1D2475;
    border-radius: 15px;
    float: left;
    color: #cccccc;
    width: 15%;
    margin: 10px;
    padding: 10px;
}

*:hover {
    background-color:#A6CE39;
}