body {
    width: 60%;
    margin: auto;
    font-family: Arial, Tahoma, sans-serif;
    background-color: lightcoral;
}

h1 {
    color: #36454F;
    text-align: center;
    background-color: lightgray;
    padding: 30px;
}

.mainlist {
    background-color: lightgray;
    width: 300px;
    margin: auto;
    padding: 25px;
}

.mainlist li {
    border: 3px solid #36454F;
    margin: 50px 10px;
    padding: 5px;
}

.liststyleposition {
    list-style-position: inside;
}

.picture {
    display: block;
    margin: auto;
}

div {
    padding: 10px;
    background-color: lightgray;
}

button {
    background-color: lightgray;
    margin-top: 5px;
}

#source {
    font-weight: 800;
    background-color: lightgray;
    display: inline-block;
    padding: 6px 3px;
}