.contents {
    /*background-color: hsla(0, 0%, 57%, 0.24);*/
    max-width: 50%;
    height:  75%;
    margin-left: auto;
    margin-right: auto;
    padding: 15px 15px;
    border-radius: 7.5px;
}

.contents *{
    color: rgb(51, 51, 51);
}

.contents .title {
    text-align: center;
    font-size: 50px;
}

.contents .header {
    font-size: 25px;
}