* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    text-align: center;
    background-color: #011F3F;
    line-height: 1.5;
    font-family: space Grotesk;
    font-weight: 500;
    font-size: 18px;
    overflow-y: hidden;
}

h1 {
    color: aliceblue;
    margin-top: 40px;
}

.row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 55px;
    margin: 32px 410px;
}

.btn {
    border: solid black 7px;
    border-radius: 25px;
    height: 200px;
    width: 200px;
}

#blue {
    background-color: blue;
}
#red {
    background-color: red;
}
#yellow {
    background-color: yellow;
}
#green {
    background-color: green;
}

.btn-flash-animation {
    box-shadow: 2px 2px 4px 4px whitesmoke;
}

.game-over {
    background-color: red;
}