index.css

:root {
    --primary-color: #d6d6d6;
    --font-color: #000000;

}

h2 {
    margin: 0;
}

body {
    background-color: var(--primary-color);
    font-family: 'Roboto', sans-serif;
    font-size: 16px;
    color: #333;
    margin: 0;
    padding: 0;
    align-items: center;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    padding: 0;
    color: var(--font-color);
}

.box {
    width: 100%;
    height: 15vh;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    margin-top: 200px;
}

.container {
    width: 50%;
    display: flex;
    justify-content: space-around;
}

.card {
    width: 90px;
    height: 150px;
    background-color: rgb(211, 206, 189);
}

.card img {
    width: 90px;
    height: 150px;
}


/* #start {
    width: 100px;
    height: 50px;
    border-radius: 10px;
    font-size: 1.5rem;
    margin: 10px;
    font-weight: 700;
    color: var(--font-color);
    cursor: pointer;
    margin-top: 170px;
} */

.containerData {
    display: flex;
    justify-content: space-around;
    margin-top: 200px;
}

.containerData>div {
    display: flex;
    height: 100px;
    flex-direction: column;
    justify-content: space-around;
}

.result {
    opacity: 0;
}

.mainbtn button {
    padding: 2px 10px;
    font-size: 20px;
}

.hidden {
    display: none;
}

.show {
    display: block;
    opacity: 1;
}

.win {
    color: green;
    font-size: 2rem;
}

.lose {
    color: red;
    font-size: 2rem;
}