body {
    margin-top: 20px;
    margin-left: 5%;
    margin-right: 5%;
    background-color: coral;
}

.infoblock {
    background-color: lightgreen;
    padding: 30px;
}

#banner img {
    width: 100%;
    background-color: papayawhip;
}

summary {
    background: limegreen;
    padding: 2px 5px 7px;
}

summary:hover {
    cursor: pointer;
}

details[open] {
    background: lightgreen;
    padding: 0 0 5px;
}