How to let a text blink and change color

Issue

I programmed an alarm clock as my first Web-project. Now I want, that my RemainingTime "clock" starts blinking and changing color after every 15 minutes for 1 minute. I found some code in the internet but that doesnt work for me :/ I started the funktion blinking() with checking if the minutes/15 is an integer value. Thanks for helping me :)

function blinking()
{
    remainingMinutes = Math.floor(pDateTime.getTime() - new Date().getTime()) / 60000;
    remainingMinutesf = Math.ceil(remainingMinutes % 60).toString().padStart(2, "0");
    console.log(remainingMinutesf);

    if(Number.isInteger(remainingMinutesf/15))
    {
        var BlinkingClock = document.getElementById("Remainclock");
        setInterval(function()
        {
            
        },1000)

    }

}

#RemainClock {
    font-family: 'Orbitron', sans-serif;
    font-size: 5vw;
    background-image: linear-gradient(180deg,
        rgba(99,253,136,1) 0%,
        rgba(51,197,142,1) 50%,
        rgba(39,97,116,1) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -moz-background-clip: text;
    -webkit-text-fill-color: transparent; 
    -moz-text-fill-color: transparent;
}

Solution

function blinking()
{
    var BlinkingClock = document.getElementById("RemainClock");
    BlinkingClock.style.color = "red";
    BlinkingClock.style.visibility = (BlinkingClock.style.visibility == "hidden" ? "" : "hidden");


}

Answered By - Argaros