style.css

body{
    background: #000000;
    color: #cecece;
}

body::-webkit-scrollbar {
    width: 1vh;
}

body::-webkit-scrollbar-track {
    box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
}

body::-webkit-scrollbar-thumb {
    background-color: #cecece;
    outline: 1px solid slategrey;
}

span{
    cursor: pointer;
}

.button{
    margin: 5px;
    border: 1px solid #cecece;
}

.titre{
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.demineur{
    display: flex;
    justify-content: center;
    justify-items: center;
    position: absolute;
    top: 5%;
    left: 50%;
    transform: translate(-50%, -5%);
}

.The_end{
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.row{
    display: flex;
    flex-direction: row;
    box-sizing: border-box;

}


.visible{
    background-color: #2f2f2f;
    border: 5px solid #0c0c0c;
}
.hidden{
    background-color: #0c0c0c;
    border: 5px solid #2f2f2f;
}

.cells{

    width: 75px;
    line-height: 70px;
    height: 75px;
    font-weight: bold;
    text-align: center;
    font-size: 50px;
    cursor: pointer;
}