style.css

:root {
    --bg-color: #1b1b1b;
    --emphisize-color: #505050;
    --default-border: 2px solid #ffffff00;
    --emphisize-boarder: 2px solid #ffffff7f;
}

em {
    color: #28fffb;
    font-style: normal;
}


img, video {
    object-fit: contain;
    width: 100%;
    height: 100%;
}


body {
    background-color: var(--bg-color);
    color: #dddddd;
    object-fit: cover;
    overflow: hidden;
    font-family: sans-serif;
}

#title {
    font-size: 500%;
    margin: 0%;
}

#slidescreen::backdrop {
    background-color: var(--bg-color);
}

#slider {
    appearance: none;
    writing-mode: bt-lr;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    outline: none;
    opacity: 0.1;
    -webkit-transition: .2s;
    transition: .2s;
}

#slider:hover {
    background: var(--emphisize-color);
}

#slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    background: #000000;
    cursor: pointer;
}
  
#slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    background: #FFFFFF;
    cursor: pointer;
}

#slide {
    border: 
    transition: border 0.5s;
}

#number {
    margin: auto;
}

#slider {
    grid-column: 1;
    grid-row: 2;
}
#title {
    grid-column-start: 1;
    grid-column-end: 3;
    grid-row: 1;
}
#container {
    grid-column: 2;
    grid-row-start: 2;
    grid-row-end: 4;
}
#number {
    grid-column: 1;
    grid-row: 3;
}
#slide{
    grid-column: 2;
    grid-row: 2;
}