style.css

body {
    margin: 0%;
    height: 100vh;
    background-size: cover;
    background-repeat: no-repeat;
    justify-content: center;
    align-items: center;
    display: flex;
}

#apexContainer {
    padding: 2vw;
    border-radius: 15px;
    backdrop-filter: blur(5px);
    background: rgba(0, 0, 0, 0.3);
    box-shadow: 0px 0px 90px rgba(0, 0, 0, 1);
    animation: apexContainerAnimation 200ms ease-in-out 0s 1;
}

@keyframes apexContainerAnimation {
    0% {
        transform: scaleY(0);
    }
    100% {
        transform: scaleY(1);
    }
}

#headingContainer {
    color: #fff;
    font-family: 'Fira Code';
    font-size: 2vw;
    text-align: center;
}

#clockContainer {
    color: #fff;
    font-family: 'Fira Code';
    font-size: 10vw;
    line-height: 12vw;
    font-weight: bold;
    text-align: center;
    text-shadow: 0px 5px 4px rgba(255, 255, 255, 0.5);
}

#bookmarksContainer {
    margin: 0%;
    padding: 0%;
    text-align: center;
}

.bookmark {
    display: inline-block;
    transition: 0.2s;
}

.bookmark:hover {
    transform: scale(1.2);
}

.bookmark img {
    width: 3vw;
}

#settingsContainer {
    font-family: 'Fira Code';
    color: #fff;
    display: grid;
    grid-template-rows: 0.1fr 1fr;
    animation: settingsAnimation 100ms linear 0s 1;
}

@keyframes settingsAnimation {
    0% {
        opacity: 0%;
    }
    100% {
        opacity: 100%;
    }
}

#categoryContainer {
    text-align: center;
    padding: 1vw;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.button {
    border: none;
    border-radius: 5px;
    margin: 0vw 0.5vw 0vw 0.5vw;
    color: #fff;
    font-family: 'Fira Code';
    font-size: 1em;
    box-shadow: 0px 5px 5px rgba(0, 0, 0, 0.3);
    background-color: rgba(255, 255, 255, 0.1);
    transition: 0.2s;
}

.button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.button:focus {
    background-color: rgba(255, 255, 255, 0.3);
}

.inputField {
    border: none;
    border-radius: 5px;
    margin: 0vw 0vw 1vw 0vw;
    padding: 0.5vw 0.5vw 0.5vw 1vw;
    width: 90%;
    font-family: 'Fira Code';
    color: #fff;
    background-color: rgba(255, 255, 255, 0.2);
    opacity: 0.9;
    transition: opacity 0.2s;
}

.inputField:hover {
    opacity: 1;
}

.inputRange {
    -webkit-appearance: none;
    border: none;
    border-radius: 5px;
    height: 0.5vw;
    width: 95%;
    background: rgba(255, 255, 255, 0.3);
    opacity: 0.9;
    transition: opacity 0.2s;
    margin: 0vw 0vw 1vw 0vw;
}

.inputRange::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 5px;
    background: #fff;
}

.inputRange::-moz-range-thumb {
    height: 20px;
    width: 20px;
    border-radius: 5px;
    background: #fff;
}

.inputRange:hover {
    opacity: 1;
}