header {
    display: flex;
    justify-content: space-between;
    width: 100%;
}

header h4 {
    display: inline-block;
    text-align: left;
    margin-left: 15px;
}

header ul {
    display: inline-flex;
    margin-bottom: 0;
    list-style: none;
}

header ul > li {
    margin: 0 10px;
}

header ul > li > a{
    color: white;
}

#seconds {
    display: inline-block;
}

.correct {
    color: green;
}

.incorrect {
    color: red;
    text-decoration: underline;
}

button {
    background: none !important;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0 !important;
}

button:focus {outline:0;}

.active {
    color: greenyellow;
}

.levelModeActive {
    color: greenyellow;
}