*, *::before, *::after {
    box-sizing: border-box;
}

body{
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    cursor: pointer;
    background-color: darkgreen;
}

.container {
    position: absolute;
    bottom: 10px;
    left:10px;
    right: 10px;
    max-width: 100%;
    height: 100px;
    color: aliceblue;
    text-align: center;
    font-size: 25px;
    /*mix-blend-mode: difference;*/
}

.btn-grid {
    display: grid;
    grid-template-rows: auto auto;
    gap: 10px;
    margin-top: 20px;
}

.btn {
    padding : 5px 10px;
    background-color: transparent;
    color: aliceblue;
    border: none;
    cursor: pointer;
    /*mix-blend-mode: difference;*/
}

.btn:hover {
    background-color: dodgerblue;
}

.start {
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    background-color: #f0f0f0;
    color: #333;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    position: absolute;
    text-align: center;
    font-size: 200px;
}