popup.css

html {
    height: 100px;
    width: 300px;
}

button {
    font-family: "Courier New";
    margin-top: 10px;
    margin-right: 10px;
    margin-bottom: 5px;
    border-color: lavender;
    border-radius: 0px;
    padding: 8px 8px;
    background-color: lavender;
    font-size: 14px;
    box-shadow: 0 4px lightgray;
    outline: none;
    border-radius: .5em;
}

button:hover {
    background-color: lightcyan;
    border-color: lightsteelblue;
    box-shadow: 0 4px lightsteelblue;
}

button:active {
    box-shadow: 0 2px lightsteelblue;
    transform: translateY(2px);
}

header {
    color: darkslategray;
    font-family: "Courier New";
    font-weight: bolder;
    font-size: 28px;
    margin-top: 30px;
}

header:hover {
    background: lightcyan;
}

p {
    color: darkslategray;
    font-family: "Courier New";
    font-size: 14px;
}

p:hover {
    font-weight: bold;
}

div {
    border-color: lightcyan;
}

.box {
    padding-top: 15px;
    padding-bottom: 10px;
    background-color: lavender;
    border-bottom: 2px solid gray;
    border-radius: .5em;
}

.box:hover {
    font-weight: bold;
    background: lightcyan;
    border-bottom: 2px solid lightsteelblue;
}

.box.over {
    border: 2px dotted #666;
}

.dropzones {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
}

[draggable] {
    user-select: none;
}