Timer with fade

//Put the commands you want timer for inside here.
//Don't include '!'
const cooldowns = {
    'gamble': 5,
    'slots': 1,
    'give': 1,
    'request': 1
};


/*DO NOT CHANGE ANYTHING BELOW THIS POINT IF YOU DON'T KNOW WHAT YOU ARE DOING*/
window.onload = ()=>{
    const $chatMsg = document.querySelector('textarea[data-a-target=chat-input]');
    const $sndBtn = document.querySelector('button[data-a-target=chat-send-button]');
    const $container = document.querySelector('div[data-test-selector=chat-input-buttons-container]');
    const $timerDiv = document.createElement('div');
    const updateColor = () => {
        let cmd = $chatMsg.value.match(RegExp("^!("+Object.keys(cooldowns).join('|')+")"));
        if(cmd){
            localStorage[cmd[1]] = Date.now() + (cooldowns[cmd[1]] * 60e3);
            let el = document.getElementById(cmd[1]);
            el.style.color = "darkred";
            el.style.fontWeight = "bold";
            el.style.backroundColor="rgba(130,0,0,.8)";
        }
    };

    Object.keys(cooldowns).forEach(e=>{
        if(!localStorage[e]){
            localStorage[e] = Date.now() + cooldowns[e] * 60e3;
        }
    });

    Object.keys(cooldowns).forEach(e=>{
        let el = document.createElement('div');
        el.id = e;
        el.className = "tw-relative";
        el.style.margin = "0 .5em";
        el.innerText = "!"+e;
        el.style.color = localStorage[e] > Date.now() ? 'darkred':'green';
        el.style.fontWeight = localStorage[e] > Date.now() ? 'normal':'bold';
        el.style.backgroundColor = localStorage[e] > Date.now() ? 'rgba(130,0,0,.8)':'transparent';


        $timerDiv.appendChild(el);
    });

    $timerDiv.className = "tw-align-content-center tw-align-items-center tw-flex tw-flex-row";
    $container.insertBefore($timerDiv, $container.children[$container.children.length-1]);

    $sndBtn.addEventListener('click',updateColor);
    $chatMsg.addEventListener('keydown', e=>{
        if(e.keyCode != 13) return;
        updateColor();
    });

    setInterval(()=>{
        Object.keys(cooldowns).forEach(e=>{
            if(localStorage[e] < Date.now()){
                let el = document.getElementById(e);
                el.style.color = "green";
                el.style.fontWeight = "bold";
                el.style.backgroundColor ="transparent";
            }else{
                let el = document.getElementById(e);
                var alpha = ((localStorage[e] - Date.now())/(cooldowns[e]* 60e3));
                el.style.backgroundColor = "rgba(130,0,0,"+.8*alpha+")";




            }
        });
    },1e3);
};