style.css

html {
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}

body {
    display: flex;
    flex-wrap: wrap;
    height: 98vh;
    justify-content: space-between;
    align-items: center;
}

body div {
    width: 100%;
    display: flex;
}

html {
    border: 0;
    margin: 0;
    padding: 0;
}

#nav {
    align-items: center;

    border-color: black;
    border-style: solid;
    border-width:0 0 2px 0;
}

#nav a {
    width: 12%;

    text-align: center;
    text-decoration: none;
    margin-right: 2%;
    font-size: 20px;
    padding: 8px;

    border-style: solid;
    border-width: 2px;
    border-radius: 5px 5px 0 0;
    border-bottom: 0;
}

#nav a:visited{
    color: black;
}

#nav h1 {
    align-self: flex-end;
    margin-left: auto;
    margin: 0 0 0 auto;
}

textarea {
    min-width: 30%;
    overflow: auto;
    white-space: nowrap;
    resize: none;
    background: #f4f4f9;
    outline: none;
    font-family: Courier, sans-serif;
    font-weight: bold;
    color: rgb(68, 67, 67);
    font-size: 14px;
}

iframe {
    min-width: 40%;
    max-width: 70%;
    width: 70%;
}

iframe p {
    font-weight: normal;
}

label {
    font-family: 'Franklin Gothic Light', 'Arial Narrow', Arial, sans-serif;
}

details {
    clear: both;
}

section {
    min-height: 100%;
    width: 50px;
}

section img {
    width: 40%;
    height: auto;
}

details.accordion {
    overflow: hidden;
    width: 100%;
    height: 100%;
}

summary {
    font-size: 40px;
    writing-mode: vertical-lr;
    margin: 0;
}

details.accordion>* {
    float: left;
}

details iframe {
    min-width: 85%;
    height: 100%;
    margin: 0;
    border: 0;
}

#playButton {
    height: 90vh;
    width: 50px;
    align-self: start;
}

.dropdown-container {
    display: flex;
    align-items: center;
    width: 100%;
    margin: 10px;

    font-size: 20px;
}

.dropdown-container>*{
    max-width: 9%;
    margin: 0 10px;
}

.dropdown-container select {
    width: 100px;
    max-width: 80%;
}