Hide Video Control Except Progress Bar in Articulate Storyline (JavaScript): Code

//Hide Video Control Except Progress Bar in Articulate Storyline (JavaScript): Code
chnage_Position();
set_Optcity();
hide_Control();
add_Margin();

//Chnage Position
function chnage_Position()
{
var modernVideoControls = document.getElementsByClassName("modern-video-controls");
var videoSeekbar = document.getElementsByClassName("video-seekbar");
var videoSeekbarHitarea = document.getElementsByClassName("video-seekbar-hitarea");

for (var i = 0; i < modernVideoControls.length; i++) {
    modernVideoControls[i].style.position = "none";
}

for (var i = 0; i < videoSeekbar.length; i++) {
    videoSeekbar[i].style.position = "none";
}

for (var i = 0; i < videoSeekbarHitarea.length; i++) {
    videoSeekbarHitarea[i].style.position = "none";
}
}

// Set Opicity
function set_Optcity()
{
var modernVideoControls = document.getElementsByClassName("modern-video-controls");
var videoAnimationContainer = document.getElementsByClassName("video-animation-container");
var controlBackground = document.getElementsByClassName("control-background");

for (var i = 0; i < modernVideoControls.length; i++) {
    modernVideoControls[i].style.backgroundColor = "rgba(0, 0, 0, 0)";
}

for (var i = 0; i < videoAnimationContainer.length; i++) {
    videoAnimationContainer[i].style.backgroundColor = "rgba(0, 0, 0, 0)";
}

for (var i = 0; i < controlBackground.length; i++) {
    controlBackground[i].style.backgroundColor = "rgba(0, 0, 0, 0)";
}
}

//Hide COntrol
function hide_Control()
{

    var classes = ["video-controlbar", "seek-enabled", "elapsed-time-enabled", "volume-enabled", "playback-speed-enabled", "pip-enabled", "full-screen-enabled"];

  classes.forEach(function(className) {
    var x = document.querySelectorAll("." + className);
    for (var i = 0; i < x.length; i++) {
        x[i].style.display = "none";
    }
  });

}

 //Add Margin
 function add_Margin()
 {
var modernVideoControls = document.getElementsByClassName("modern-video-controls");
var videoSeekbar = document.getElementsByClassName("video-seekbar");

for (var i = 0; i < modernVideoControls.length; i++) {
    modernVideoControls[i].style.marginTop = "38px";
}

for (var i = 0; i < videoSeekbar.length; i++) {
    videoSeekbar[i].style.marginTop = "38px";
}

 }