How to color the CSS loader?

I have working code for a CSS preloader at CSS preloader sample

I would like the animated preloader to be colored. I tried adding the style color: red !important; to various styles to the CSS class lds-ripple, but it did nothing. A colored preloader would look more impressive in my view.

How would I make the CSS preloader show with colored rings?

the same code from working sample is also pasted below.

<button id="btnShow" onclick="showLoader()">Show Loader</button>
<div id="loader">
<div class="lds-ripple"><div></div><div></div></div>
</div>

<style>
#loader {
  display: none;
  justify-content: center;
  align-items: center; 
  width:100%;
  height:100%;
  border:green solid 1 px;
  opacity:0.9;
  background-color:whitesmoke;
  position:absolute;
  left:0;
  top:0;
 }
.lds-ripple {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-ripple div {
  position: absolute;
  border: 4px solid #fff;
  opacity: 1;
  border-radius: 50%;
  animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
 }
.lds-ripple div:nth-child(2) {
  animation-delay: -0.5s;
}
@keyframes lds-ripple {
  0% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  4.9% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  5% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: 0px;
    left: 0px;
    width: 72px;
    height: 72px;
    opacity: 0;
  }
}


</style>
<script>
function showLoader() {
  document.getElementById("loader").style.display = "flex";
}
</script>

#fff in the line marked below can be changed to set the loader's color.

.lds-ripple div {
  position: absolute;
  border: 4px solid #fff; /* edit this line */
  opacity: 1;
  border-radius: 50%;
  animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

For example:

function showLoader() {
  document.getElementById("loader").style.display = "flex";
}
showLoader();

#loader {
  display: none;
  justify-content: center;
  align-items: center; 
  width:100%;
  height:100%;
  border:green solid 1 px;
  opacity:0.9;
  background-color:whitesmoke;
  position:absolute;
  left:0;
  top:0;
 }
.lds-ripple {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
}
.lds-ripple div {
  position: absolute;
  border: 4px solid red;
  opacity: 1;
  border-radius: 50%;
  animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
 }
.lds-ripple div:nth-child(2) {
  animation-delay: -0.5s;
}
@keyframes lds-ripple {
  0% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  4.9% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  5% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: 0px;
    left: 0px;
    width: 72px;
    height: 72px;
    opacity: 0;
  }
}

<div id="loader">
<div class="lds-ripple"><div></div><div></div></div>
</div>