body {
    background-color: #fff;
    text-align: center;
    font-family: 'Russo One', sans-serif;
    background-color: rgb(110, 137, 143);
}

h1 {
    font-size: 4rem;
    letter-spacing: 0.3rem;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: 0.3rem;
}

button {
    font-family: 'Russo One', sans-serif;
    font-size: 2rem;
    border: 5px solid black;
    border-radius: 5%;
}

.button-container {
    display: grid;
    grid-template-columns: 200px 200px;
    grid-template-rows: 200px 200px;
    gap: 30px;
    justify-content: center;
    margin-top: 100px;
}

.green {
    background-color: rgb(10, 121, 0);
}

.red {
    background-color: rgb(255, 0, 0);
}

.blue {
    background-color: rgb(0, 115, 255);
}

.yellow {
    background-color: rgb(255, 255, 0);
}

.choosen {
    opacity: 0.2;
}

.game-over {
    animation: blinkingBackground 2s infinite;
}

@keyframes blinkingBackground {
    0% {background-color: rgb(255, 0, 0);}
    25% {background-color: #fff;}
    50% {background-color: rgb(255, 0, 0);}
    75% {background-color: #fff;}
    100% {background-color: rgb(255, 0, 0);}
}