header {
    position: relative;
    display: flex;
    justify-content: space-between;
    width: 100%;
    z-index: 6;
}

header::before {
    content: "";
    background-color: rgb(250, 252, 175);
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    opacity: 0.3;
    z-index: -1;
}

.column-header {
    padding: 1vmin;
    font-size: 90%;
    display: flex;
    flex-direction: column;
}

#droite_header {
    padding: 1vmin;
    font-size: 55%;
    display: flex;
}

#bouton_règles {
    margin: 0.75vmin;
}

.règles {
    padding: 0.75vmin;
    cursor: pointer;
}

#règles_jeu {
    font-size: 50%;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 26vmin;
    display: none;
    background-color: #1FC2FF;
    z-index: 3;
}

#mode_jeu {
    padding: 1vmin;
    font-size: 55%;
}

#centre_header {
    display: flex;
    align-items: center;
    margin-bottom: 1vmin;
}

left-center-header{
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.choix_nickname {
    pointer-events: auto;
    display: flex;
    flex-direction: row;
}

#nickname {
    display: flex;
    flex-direction: row;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    justify-content: center;
}

#action {
    display: flex;
    flex-direction: row;
    justify-content: center;
    margin: 0.75vmin;
}

#action > * {
    cursor: pointer;
    margin-left: 2vmin;
    margin-right: 2vmin;
    padding: 0.75vmin;
    font-size: 80%;
}

input[type="text"] {
    position: relative;
    background-color: rgb(247, 219, 163);
    width: 20vmin;
    height: 4vmin;
    align-items: center;
    margin: 0 auto;
    text-align: center;
    font-size: 50%;
}