*, *::after, *::before {
    box-sizing: border-box;
    font-family: Avenir, sans-serif;
}

body {
    position: relative;
    width: 100vw;
    height: 100vh;
    margin: 0;

    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;

    background: repeat center/100% url(circle-background.svg), linear-gradient(to bottom, red, darkviolet);
}

#startButton {
    position: absolute;
    top: 25%;
    margin: 0 auto;
    padding: 20px;

    font-size: 20px;
    letter-spacing: 3px;
    text-transform: uppercase;

    cursor: pointer;

    transition: transform .2s ease-in-out;
}

#startButton:hover {
    transform: scale(1.03);
}

#startButton.disabled {
    display: none;
}

.card {
    border-radius: 5px;
    border-left: 1px solid white;
    border-top: 1px solid white;
    background-color: rgba(255, 255, 255, 0.3);
    box-shadow: 10px 10px 30px rgba(50, 50 , 50, 0.5);
    backdrop-filter: blur(50%);
}

#statsBar {
    margin: 40px;
    padding: 30px;

    display: flex;
    justify-content: space-between;
    align-items: center;

    font-size: 30px;
    font-weight: lighter;
    letter-spacing: 4px;
}

#timer {
    width: 100px;
    margin: 0 15px;

    display: block;

    text-align: center;
}

.mode {
    font-size: 20px;
    cursor: pointer;
}

.mode.selected {
    border-bottom: 2px solid black
}

#gameField {
    width: 500px;
    height: 600px;
    padding: 10px;
}