* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease-in-out;
    overflow: hidden;
}

#header {
    height: 30vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.4s ease-in-out;
}

.glassbox {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    backdrop-filter: blur(25px);

    width: 50vw;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.glassbox h2 {
    font-size: 2rem;
    letter-spacing: 2px;
}

.container {
    width: 50vw;
    height: 70vh;
    max-height: 70vh;
    padding: 25px 0;
    display: grid;
    gap: 20px;
}

.item {
    background-color: rgba(255, 255, 255, 0.8);
    font-size: 30px;
    text-align: center;
    border-radius: 10px;
    box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.4);
    transition: all 0.2s ease-in-out;
    cursor: pointer;
}

.container.easy {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: 1fr;
}

.container.medium {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.container.hard {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

#themetoggle {
    position: absolute;
    top: 0;
    right: 0;
    margin: 10px;
    width: 50px;
    height: 50px;
    border-radius: 10px;
    transition: all 0.4s ease-in-out;
    overflow: hidden;
    box-shadow: 0px 0px 15px 0px rgba(0, 0, 0, 0.4);
}

#themetoggle i {
    font-size: 1.3rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.4s ease-in-out;
}

.intro {
    height: 50%;
}

.options {
    padding: 0px 10px;
    margin-top: 10px;
    height: 15%;
    min-height: 55px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.options button {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    backdrop-filter: blur(25px);
    padding: 8px 10px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    font-weight: 500;
}

.options button:hover {
    background: rgba(255, 255, 255, 0.3);
}