body {
    display: flex;
    flex-direction: row;
    padding: 0px;
    margin: 0px;
    align-items: stretch;
    justify-content: stretch;
}

body > div {
    height: 100vh;
    overflow-y: auto;
}

#leftpanel {
    width: 400px;
    padding: 10px;
    background-color: rgb(221, 184, 255);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

#contpanel {
    padding: 20px;
    box-sizing: border-box;
    text-align: center;
    flex-grow: 2;
}

#contpanel > div {
    max-width: 800px;
    text-align: left;
    display: inline-block;
}

#leftpanel > img {
    width: 128px;
    margin-left: auto;
    margin-right: auto;
    display: inline-block;
}

#titleblock {
    display: flex;
    flex-direction: row;
    color: black;
    text-decoration: none;
}

#titleblock > p {
    flex-grow: 2;
}

#titleblock > img {
    width: 100px
}

#titleblock > * {
    padding: 10px;
}

.subject > input {
    display: none;
}

.subject > input + label + div {
    height: 0px;
    overflow: hidden;
}

.subject > input:checked + label + div {
    height: min-content;
}

.subject > input + label::before {
    content: "▶";
}

.subject > input:checked + label::before {
    content: "▼";
}

.subject > label {
    font-weight: bold;
}

.subject > div > a {
    padding: 10px;
    display: block;
}

.subject > div > a:hover {
    background-color: red;
}