style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Impact, "Arial Narrow Bold", sans-serif;
    color: #252525;
}

body {
    padding: 1%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.title {
    text-align: center;
    font-size: 36px;
}

.grid__container {
    background-color: #000000;
    display: flex;
    flex-wrap: wrap;
    flex: auto;
    width: 500px;
    height: 500px;
    border-radius: 4px;
    gap: 1px;
}

.grid__reset {
    background-color: #0000ff;
    width: 80px;
    height: 30px;
    border: none;
    border-radius: 7px;
    color: #ffffff;
    font-size: 20px;
    font-weight: bold;
    box-shadow: #646363 4px 4px 6px;
    transition: scale 0.3s;
    transition: box-shadow 0.2s;
}

.grid__reset:hover {
    scale: 1.05;
}

.grid__reset:active {
    scale: 0.95;
    box-shadow: none;
}

.grid__container-row {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.grid__container-row-square {
    flex: 1 1 auto;
}