* {
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
    color: white;
}

:root {
    --cell-size: 7vh;
    --mark-size: cal(var(--cell-size) * 0.9)
}

html, body {
    margin: 0;
    height: 100%;
}

body {
    margin: 0;
    background-color: #29539b;
    background-image: linear-gradient(315deg, #29539b 0%, #1e3b70 74%);
}


.header {
    font-weight: bold;
    font-size: 3vh;
    text-align: center;
    padding: 1rem 0 1rem;
}

h3 {
    text-align: center;
    justify-content: center;
}

.label {
    color: #ff3399;
    font-weight: bold;
}

.board {
    width: 100vw;
    display: grid;
    justify-content: center;
    align-content: center;
    justify-items: center;
    align-items: center;
    grid-template-columns: repeat(5, auto);
}

.cell {
    color: black;
    width: var(--cell-size);
    height: var(--cell-size);
    font-weight: bolder;
    margin: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #d3d6da;
    font-size: 5rem;
}

.btn-container {
    text-align: center;
    margin: 4vh 0;
}

.btn-container button {
    background: grey;
    font-size: 16px;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: bold;
    width: 200px;
}

button:hover {
    color: black;
    cursor: pointer;
}