.koeficient {
    width: 1.2em;
    text-align: right;
    padding: 0.2em;
    border: 1px solid #bbb;
    font-size: 1rem;
}

.correct {
    color: darkgreen;
}

.wrong {
    color: red;
}

.element {
    display: inline-block;
    margin: 0.1em;
    padding: 0.2em;
}

.element:hover {
    background-color: #eee;
    cursor: pointer;
}