How to change the variables that have been written in class using media queries?

HTML-CSS
1

Tell us what’s happening:
Hello,

I just learned about dynamically changing variables using media queries. But there are parts that I don’t understand. In an example where a variable that can be changed is written in :root, then Is it possible to change the variable defined in the class?

Thanks!

Your code so far


<style>
:root {
  --penguin-size: 300px;
  --penguin-belly: white;
  --penguin-beak: orange;
}

@media (max-width: 350px) {
  .penguin {
    /* Is this possible? */
    --penguin-skin: black;
  }
}

.penguin {
  --penguin-skin: gray;
  position: relative;
  margin: auto;
  display: block;
  margin-top: 5%;
  width: var(--penguin-size, 300px);
  height: var(--penguin-size, 300px);
}

.right-cheek {
  top: 15%;
  left: 35%;
  background: var(--penguin-belly, white);
  width: 60%;
  height: 70%;
  border-radius: 70% 70% 60% 60%;
}

.left-cheek {
  top: 15%;
  left: 5%;
  background: var(--penguin-belly, white);
  width: 60%;
  height: 70%;
  border-radius: 70% 70% 60% 60%;
}

.belly {
  top: 60%;
  left: 2.5%;
  background: var(--penguin-belly, white);
  width: 95%;
  height: 100%;
  border-radius: 120% 120% 100% 100%;
}

.penguin-top {
  top: 10%;
  left: 25%;
  background: var(--penguin-skin, gray);
  width: 50%;
  height: 45%;
  border-radius: 70% 70% 60% 60%;
}

.penguin-bottom {
  top: 40%;
  left: 23.5%;
  background: var(--penguin-skin, gray);
  width: 53%;
  height: 45%;
  border-radius: 70% 70% 100% 100%;
}

.right-hand {
  top: 5%;
  left: 25%;
  background: var(--penguin-skin, black);
  width: 30%;
  height: 60%;
  border-radius: 30% 30% 120% 30%;
  transform: rotate(130deg);
  z-index: -1;
  animation-duration: 3s;
  animation-name: wave;
  animation-iteration-count: infinite;
  transform-origin:0% 0%;
  animation-timing-function: linear;
}

@keyframes wave {
    10% {
      transform: rotate(110deg);
    }
    20% {
      transform: rotate(130deg);
    }
    30% {
      transform: rotate(110deg);
    }
    40% {
      transform: rotate(130deg);
    }
  }

.left-hand {
  top: 0%;
  left: 75%;
  background: var(--penguin-skin, gray);
  width: 30%;
  height: 60%;
  border-radius: 30% 30% 30% 120%;
  transform: rotate(-45deg);
  z-index: -1;
}

.right-feet {
  top: 85%;
  left: 60%;
  background: var(--penguin-beak, orange);
  width: 15%;
  height: 30%;
  border-radius: 50% 50% 50% 50%;
  transform: rotate(-80deg);
  z-index: -2222;
}

.left-feet {
  top: 85%;
  left: 25%;
  background: var(--penguin-beak, orange);
  width: 15%;
  height: 30%;
  border-radius: 50% 50% 50% 50%;
  transform: rotate(80deg);
  z-index: -2222;
}

.right-eye {
  top: 45%;
  left: 60%;
  background: black;
  width: 15%;
  height: 17%;
  border-radius: 50%;
}

.left-eye {
  top: 45%;
  left: 25%;
  background: black;
  width: 15%;
  height: 17%;
  border-radius: 50%;
}

.sparkle {
  top: 25%;
  left:-23%;
  background: white;
  width: 150%;
  height: 100%;
  border-radius: 50%;
}

.blush-right {
  top: 65%;
  left: 15%;
  background: pink;
  width: 15%;
  height: 10%;
  border-radius: 50%;
}

.blush-left {
  top: 65%;
  left: 70%;
  background: pink;
  width: 15%;
  height: 10%;
  border-radius: 50%;
}

.beak-top {
  top: 60%;
  left: 40%;
  background: var(--penguin-beak, orange);
  width: 20%;
  height: 10%;
  border-radius: 50%;
}

.beak-bottom {
  top: 65%;
  left: 42%;
  background: var(--penguin-beak, orange);
  width: 16%;
  height: 10%;
  border-radius: 50%;
}

body {
  background:#c6faf1;
}

.penguin * {
  position: absolute;
}
</style>
<div class="penguin">
<div class="penguin-bottom">
  <div class="right-hand"></div>
  <div class="left-hand"></div>
  <div class="right-feet"></div>
  <div class="left-feet"></div>
</div>
<div class="penguin-top">
  <div class="right-cheek"></div>
  <div class="left-cheek"></div>
  <div class="belly"></div>
  <div class="right-eye">
    <div class="sparkle"></div>
  </div>
  <div class="left-eye">
    <div class="sparkle"></div>
  </div>
  <div class="blush-right"></div>
  <div class="blush-left"></div>
  <div class="beak-top"></div>
  <div class="beak-bottom"></div>
</div>
</div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0.

Challenge: Use a media query to change a variable

Link to the challenge:

2

Hi @yt2951. Welcome to FCC.

Yes it is possible to ‘change’ a variable declared inside :root in any other selector. It is actually called multiple declaration. You can read more about the effect of doing that in the freeCodeCamp article below. It is a very extensive article about CSS variables. Pay special attention to " Resolving Multiple Declarations" section.

https://www.freecodecamp.org/news/everything-you-need-to-know-about-css-variables-c74d922ea855/#:~:text=CSS%20variables%20can%20be%20made,variable%2C%20gutter%20on%20larger%20devices.

1 Like
3

Got it, after reading the article you provided, I understood my mistake. I have to change the order of the code that I write, so that the order when changing colors is appropriate. Thank you very much!

1 Like