Babylon.js/sandbox/src/scss/animationBar.scss

.animationBar {
    align-items: center;
    color: white;
    min-height: 30px;
    height: var(--footer-height);
    background-color: var(--footer-background);    
    grid-column: 2;
    grid-row: 1;
    margin-left: 10px;
    display: flex;

    * {        
        padding: 0px;
        margin: 0px;
    }

    .row {
        display: flex;
        flex-direction: row;
        justify-content: center;
        flex-grow: 10;
        align-items: center
    }

    #playBtn {    
        display: flex;
        align-items: center;
        height: var(--footer-height);
        width: var(--footer-height);
        border: none;
        background-color: inherit;
        cursor: pointer;

        img {
            width: var(--footer-height);
            height: var(--footer-height);
        }

        &:hover {
            background-color: var(--button-hover-color);   
        }
    
        &:active {
            background-color: var(--button-hover-background);
        }
    
        &:focus {
            outline: none !important;
            border: none;
        }    
    }

    .slider {
        -webkit-appearance: none;
        cursor: pointer;
        width: 100%;
        max-width: 820px;
        height: var(--footer-height);
        outline: none;
        margin-left: 20px;
        margin-right: 10px;
        background-color: transparent;
    }

    /*Chrome -webkit */
    .slider::-webkit-slider-thumb {
        -webkit-appearance: none;
        width: 20px;
        height: 20px;
        border: 2px solid white;
        border-radius: 50%;
        background: var(--footer-background);
        margin-top: -10px;
    }
    .slider::-webkit-slider-runnable-track {
        height: 2px;
        -webkit-appearance: none;
        background-color: white;
    }


    /** FireFox -moz */
    .slider::-moz-range-progress {
    background-color: white;
    height: 2px; 
    }
    .slider::-moz-range-thumb{
        width: 20px;
        height: 20px;
        border: 2px solid white;
        border-radius: 50%;
        background: var(--footer-background);
    }
    .slider::-moz-range-track {
        background: white;
        height: 2px;
    }

    /** IE -ms */
    .slider::-ms-track {
        height: 2px;
        
        /*remove bg colour from the track, we'll use ms-fill-lower and ms-fill-upper instead */
        background: transparent;
        
        /*leave room for the larger thumb to overflow with a transparent border */
        border-color: transparent;
        border-width: 10px 0;

        /*remove default tick marks*/
        color: transparent;
    }
    .slider::-ms-fill-lower {
        background: white;
        border-radius: 5px;
    }
    .slider::-ms-fill-upper {
        background: white;
        border-radius: 5px;
    }
    .slider::-ms-thumb {
        width: 16px;
        height: 16px;
        border: 2px solid white;
        border-radius: 50%;
        background: var(--footer-background);
        margin-top: 0px;
    }
}

@media (max-width: 768px) {
    .animationBar {       
        margin-left: 0;
    }
}