style.css

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

body {
    background-color: teal;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
}

main h1 {
    margin-top: 10px;
}

.container {
    position: relative;
    margin-top: 20px;
    height: 80vh;
    width: 60vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    overflow: hidden;
    border-radius: 10px;

}

.game {
    margin-bottom: 25px;
    height: 50vh;
    width: 33vw;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.box {
    width: 10vw;
    height: 15vh;
    background-color: aliceblue;
    border: 2px solid black;
    box-shadow: 0 0 1rem rgba(0, 0, 0, 0.2);
    font-size: 3rem;
    color: rgb(49, 49, 49);
    border-radius: 10px;
    margin-left: 10px;
    position: relative;
    z-index: 99;
}

.container::before {
    content: '';
    height: 180vh;
    width: 20vw;
    background-image: linear-gradient(45deg, rgb(194, 83, 83), rgb(74, 74, 201), rgb(59, 172, 59), rgb(173, 173, 42), rgb(185, 103, 117));
    position: absolute;
    animation: rotate 6s linear infinite;
}

.container::after {
    content: '';
    inset: 5px;
    position: absolute;
    background: white;
    border-radius: 10px;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.btnresetgame {
    background-image: linear-gradient(90deg, rgb(210, 47, 210), pink, rgb(207, 150, 150));
    padding: 10px;
    border: 2px dotted black;
    text-align: center;
    margin-top: 10px;
    z-index: 99;
}

.btnnewgame {
    background-image: linear-gradient(90deg, rgb(210, 47, 210), pink, rgb(207, 150, 150));
    padding: 10px;
    border: 2px dotted black;
    text-align: center;
    margin-top: 10px;
}

.msg-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: absolute;
    width: 420px;
    height: 400px;
    font-size: 2rem;
    border: 5px solid black;
    background-image: linear-gradient(45deg, #00d2ff, #928dab);
    top: 100px;
    left: 440px;
    z-index: 100;
}

.msg-1 {
    padding: 20px;
    color: red;
    text-shadow: 2px 1px 0px black;
    font-size: 3rem;
}

.msg-2 {
    padding: 20px;
}

.hide {
    display: none;
}

@media (max-width : 1200px) {
    .container::before {
        width: 60vw;
    }

    .container {
        margin-top: 100px;
        width: 80vw;
        height: 60vh;
    }

    .box {
        height: 100px;
        width: 100px;
    }

    .game {
        height: 40vh;
        width: 85vw;
    }

    .msg-container {
        left: 4px;
        top: 200px;
    }

    .btnresetgame {
        margin-bottom: 40px;
    }

    .msg-1 {
        font-size: 2rem;
    }
}

@media (max-width: 376px) {
    .game {
        height: 40vh;
        width: 85vw;
        margin-top: 30px;
    }

    .container {
        margin-top: 50px;
        width: 80vw;
        height: 60vh;
    }

    .box {
        width: 86px;
        height: 86px;
        margin-bottom: 5px;
    }

    .msg-container {
        left: 8px;
        top: 106px;
        width: 358px;
        height: 380px;
    }

    .msg-1 {
        font-size: 2rem;
    }
}

@media (max-width : 415px) {
    .game {
        margin-right: 10px;
    }

    .msg-container {
        width: 405px;
    }

    .msg-1 {
        font-size: 2rem;
    }
}

@media (max-width : 390px) {
    .container {
        width: 91vw;
    }

    .msg-container {
        width: 350px;
    }

    .msg-1 {
        font-size: 2rem;
    }
}