.contents {
    text-align: center;
}

.contents img{
    width: 80%;
    margin: 5px;
}

.contents table {
    width: 80%;
    border: solid 1px black;
    margin-bottom: 50px;
}

.contents tr{
    border: solid 1px black;
}

.contents tr td{
    border: solid 1px black;
}

.contents table tr td:nth-child(1) {
    background-color: navy;
    color: white;
}
.contents table thead {
    background-color: navy;
    color: white;
}

.contents table img {
    width: 300px;
}