.instructions_popup {
    position: fixed;
    left: 10vw;
    top: 25vh;
    width: 80vw;
    height: 50vh;
    box-sizing: border-box;
    padding: 1ex;
    box-shadow: 0 0 1ex #00000077;
    border-radius: 0.5ex;
    margin: 0;
    background-color: white;
    color: black;
    display: flex;
    flex-direction: column;
    font-family: sans-serif;
    overflow-y: auto;
    z-index: 999;
}

.instructions_popup.vertical {
    width: 50vw;
    bottom: 3cm;
}

.instructions_popup h1 {
    font-size: large;
}

.instructions_popup nav {
    display: flex;
    align-items: center;
}

.instructions_popup h1 {
    flex: 1;
    text-align: center;
    margin: 0;
    padding: 0.5ex;
}

.instructions_popup button {
    width: 0.7cm;
    height: 0.7cm;
    border: none;
    background-color: transparent;
    outline: none;
}

.instructions_popup iframe {
    flex: 1;
    width: 100%;
    border: 0;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    height: 100%;
}