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Thanks comehope Big guy Front-end daily combat Enlightenment to me

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Source code address

https://github.com/shanyuhai1...

Code interpretation

Define container halloween-switcher to switch through checkbox

<section class="halloween-switcher">
  <input type="checkbox" id="halloween-input">
  <label for="switch-input" class="halloween-label">
    <div class="pumpkin-container"></div>
    <div class="vampire-container"></div>
  </label>
</section>

Introduce font, center display:

@import url('https://fonts.googleapis.com/css?family=Kodchasan');

* {
  font-family: 'Kodchasan';
}

html {
  font-size: 20px;
}

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #081219;
  overflow: hidden;
}

Set the actual container label size

.halloween-label {
  width: 30rem;
  height: 10rem;
  border: 3px solid #E56D48;
  border-radius: 10rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  position: relative;
}

Increase the color matching of two containers

html {
  --pumpkin-color: #E56D48;
  --vampire-color: #4D7C99;
}

Define pumpkin-container, vampire-container container and text

.halloween-input ~ .halloween-label::before,
.halloween-input:checked ~ .halloween-label::before {
  position: absolute;
  font-size: 2.5rem;
  text-transform: uppercase;
}
.halloween-input ~ .halloween-label::before {
  content: 'Pumpkin';
  color: var(--pumpkin-color);
  left: 70%;
  transform: translateX(-70%);
}
.halloween-input:checked ~ .halloween-label::before {
  content: 'Vampire';
  color: var(--vampire-color);
  left: 25%;
  transform: translateX(-25%);
}

.halloween-input ~ .halloween-label .pumpkin-container,
.halloween-input ~ .halloween-label .vampire-container {
  width: 9.5rem;
  height: 9.5rem;
  border-radius: 50%;
  position: absolute;
  left: 0.25rem;
  overflow: hidden;
}
.halloween-input ~ .halloween-label .pumpkin-container {
  background-color: var(--pumpkin-color);
  filter: opacity(1);
}
.halloween-input ~ .halloween-label .vampire-container {
  background-color: var(--vampire-color);
  filter: opacity(0);
}
.halloween-input:checked ~ .halloween-label .pumpkin-container {
  left: calc(100% - 0.25rem);
  transform: translateX(-100%);
  filter: opacity(0);
}
.halloween-input:checked ~ .halloween-label .vampire-container {
  left: calc(100% - 0.25rem);
  transform: translateX(-100%);
  filter: opacity(1);
}

Increase label container color gradient

.halloween-label {
  border: 3px solid var(--label-border-color);
  transition: .5s ease-in-out;
}
.halloween-label {
  --label-border-color: var(--pumpkin-color);
}
.halloween-input:checked ~ .halloween-label {
  --label-border-color: var(--vampire-color);
}

pumpkin-container , vampire-container Containers and Texts

Animation effect

.halloween-input ~ .halloween-label::before,
.halloween-input:checked ~ .halloween-label::before {
  transition: .5s ease;
}
.halloween-input ~ .halloween-label .pumpkin-container,
.halloween-input ~ .halloween-label .vampire-container {
  transition: .5s ease;
}

Draw pumpkin first, fill in pumpkin-container

<div class="pumpkin-container">
  <div class="pumpkin__eyes-n-nose"></div>
  <div class="pumpkin__mouth-n-teeths"></div>
</div>

New pulp color

html {
  --pumkin-pulp-color: #330A0F;
}

Drawing pumpkin_u eyes-n-nose

Pseudo Elements Draw Eyes

.pumpkin__eyes-n-nose {
  position: absolute;
  top: 20%;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0.8rem 1.6rem 0.8rem;
  color: var(--pumpkin-color);
  border-bottom-color: var(--pumkin-pulp-color);
  background-color: var(--pumkin-pulp-color);
}
.pumpkin__eyes-n-nose::before,
.pumpkin__eyes-n-nose::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  background-color: var(--pumkin-pulp-color);
  border-radius: 50%;
  top: 0.5rem;
  left: 0;
}
.pumpkin__eyes-n-nose::before {
  margin-left: -3.25rem;
}
.pumpkin__eyes-n-nose::after {
  margin-left: 2.25rem;
}

Drawing pumpkin_u mouth-n-teeths

Pseudo-elements paint teeth

.pumpkin__mouth-n-teeths {
  position: absolute;
  width: 6.5rem;
  height: 3.25rem;
  bottom: 10%;
  background-color: var(--pumkin-pulp-color);
  border-radius: 0 0 6.5rem 6.5rem;
}
.pumpkin__mouth-n-teeths::before,
.pumpkin__mouth-n-teeths::after {
  content: '';
  position: absolute;
  height: 0.75rem;
  width: 1rem;
  background-color: var(--pumpkin-color);
}
.pumpkin__mouth-n-teeths::before {
  top: 0;
  left: 1.25rem;
}
.pumpkin__mouth-n-teeths::after {
  height: 1rem;
  bottom: 0;
  right: 1.25rem;
}

Draw vampire again to complete vampire-container

<div class="vampire-container">
  <div class="vampire__eyes"></div>
  <div class="vampire__mouth">
    <div class="vampire__teeths"></div>
    <div class="vampire__tongue"></div>
  </div>
</div>

Using Pseudo Elements to Draw vampire-container's Face

.vampire-container::before,
.vampire-container::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #c2def2;  /* face color */
  border-radius: 45% 45% 0 0;
  top: 0.75rem;
}
.vampire-container::before {
  left: -4rem;
}
.vampire-container::after {
  right: -4rem;
}

Pseudo-elements draw vampire_u eyes

.vampire__eyes {
  top: 20%;
  position: absolute;
  z-index: 1;
}
.vampire__eyes::before,
.vampire__eyes::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  background-color: #d63e49; /* eye-color */
  border-radius: 50%;
  top: 0.5rem;
  left: 0;
}
.vampire__eyes::before {
  margin-left: -3.25rem;
}
.vampire__eyes::after {
  margin-left: 2.25rem;
}

Draw vampire_u mouth

.vampire__mouth {
  position: absolute;
  width: 6.5rem;
  height: 3.25rem;
  background-color: var(--pumkin-pulp-color);
  bottom: 10%;
  border-radius: 0 0 6.5rem 6.5rem;
  display: flex;
  justify-content: center;
  overflow: hidden;
  z-index: 1;
}

Draw the vampire_u teeth incisors, and the pseudo-elements draw the teeth.

.vampire__teeths {
  position: absolute;
  width: 100%;
  height: 1rem;
  background-color: #fffae6;
  top: -1px;
}
.vampire__teeths::before,
.vampire__teeths::after {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  color: transparent;
  border-style: solid;
  border-width: 0.65rem 0.375rem 0 0.375rem;
  border-top-color: #fffae6;
  top: 0.95rem;
}
.vampire__teeths::before {
  left: 1rem;
}
.vampire__teeths::after {
  right: 1rem;
}

Draw vampire_u tongue

.vampire__tongue {
  position: absolute;
  width: 3.5rem;
  height: 1.75rem;
  background-color: #d63e49;
  bottom: -0.75rem;
  border-radius: 3.5rem 3.5rem 0 0;
}

Then hide the checkbox.

.halloween-input {
  display: none;
}

Add smile Animation smile

.vampire__teeths {
  animation: smile 2s ease-in-out infinite;
}
.vampire__tongue {
  animation: smile 3s ease-in-out infinite;
}
@keyframes smile {
  50% {
    transform: scaleY(1.5);
  }
}

Last

That's how it works.