styles.css

body {
  background: rgb(217, 222, 232);
  display: flex;
  justify-content: center;
  margin-top: 60px;
}

body.night {
  background: rgb(55, 65, 85);
  display: flex;
  justify-content: center;
  margin-top: 60px;
  transition: background 0.45s ease-in-out;
}

.slider {
  cursor: pointer;
  height: 120px;
  width: 310px;
  border-radius: 5em;
  box-shadow: inset 0px 6px 8px 3px rgba(40, 40, 40, 0.95),
    0px 3px 3px 1.5px #ffffff;
  overflow: hidden;
  position: relative;
  background: #3898d9;
  transition: background 0.45s ease-in-out;
}

.slider.night {
  box-shadow: inset 0px 6px 8px 3px rgba(0, 0, 0, 1),
    0px 3px 3px 1.5px rgb(256, 256, 256, 0.05);
  overflow: hidden;
  position: relative;
  background: rgb(30, 35, 50);
}

.slideable-area {
  height: 100%;
  width: calc(100% - 32px);
  padding: 0 16px;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 1;
}

.sphere {
  height: 100px;
  width: 100px;
  border-radius: 50px;
  position: relative;
  transition: right 500ms cubic-bezier(0.37, 1.34, 0.11, 0.94);
  right: 0px;
}

.sphere.night {
  right: -65%;
}

.sphere-bg-wrapper {
  height: 100%;
  width: 100%;
  border-radius: inherit;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.sun {
  background: #ebcd55;
  box-shadow: inset 1px 1px 3px rgba(255, 255, 255, 0.45),
    inset -1px -5px 6px rgba(0, 0, 0, 0.35);
  height: 100%;
  width: 100%;
  border-radius: inherit;
}

.moon {
  height: 100%;
  width: 100%;
  border-radius: inherit;
  background: rgb(205, 205, 215);
  position: absolute;
  top: 0;
  right: -100%;
  opacity: 0;
  transition: all 250ms ease-out;
  transition-delay: 0.1s;
  box-shadow: inset 1px 1px 3px rgba(255, 255, 255, 0.45),
    inset -1px -5px 6px rgba(0, 0, 0, 0.35);
}

.moon.night {
  right: 0;
  opacity: 1;
}

/* Particles */
.halo {
  background: rgba(230, 230, 230, 0.15);
  position: absolute;
  top: 0;
  /*   z-index: -1; */
}

.halo:nth-child(2) {
  transform: scale(2);
}

.halo:nth-child(3) {
  transform: scale(2.8);
}

.halo:nth-child(4) {
  transform: scale(3.5);
}

.stars {
  position: absolute;
  top: -50%;
  opacity: 0;
  transition: top 0.3s ease-in, opacity 0.1s ease-in;
}

.stars.night {
  height: 100%;
  width: 100%;
  opacity: 1;
  top: 0;
}

.star::after {
  background: rgba(230, 230, 230, 1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: absolute;
  content: "\2726";
}

.star:nth-child(1)::after {
  top: 27px;
  left: 165px;
  font-size: 1.3rem;
}

.star:nth-child(2)::after {
  top: 28px;
  left: 133px;
  font-size: 0.4rem;
}

.star:nth-child(3)::after {
  top: 57px;
  left: 122px;
  font-size: 0.4rem;
}

.star:nth-child(4)::after {
  top: 66px;
  left: 162px;
  font-size: 0.4rem;
}

.star:nth-child(5)::after {
  top: 84px;
  left: 137px;
  font-size: 0.6rem;
}

.star:nth-child(6)::after {
  top: 11px;
  left: 64px;
  font-size: 1rem;
}

.star:nth-child(7)::after {
  top: 33px;
  left: 36px;
  font-size: 0.5rem;
}

.star:nth-child(8)::after {
  top: 98px;
  left: 70px;
  font-size: 0.4rem;
}

.star:nth-child(9)::after {
  top: 49px;
  left: 69px;
  font-size: 0.5rem;
}

.star:nth-child(10)::after {
  top: 82px;
  left: 47px;
  font-size: 0.3rem;
}

.star:nth-child(11)::after {
  top: 91px;
  left: 39px;
  font-size: 0.3rem;
}

.moon-crater {
  background-color: rgb(160, 170, 185);
  border-radius: 20px;
  position: absolute;
  box-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.25);
}

.moon-crater:nth-child(1) {
  height: 36px;
  width: 36px;
  top: 42px;
  left: 20px;
}

.moon-crater:nth-child(2) {
  height: 20px;
  width: 20px;
  top: 12px;
  left: 42px;
}

.moon-crater:nth-child(3) {
  height: 22px;
  width: 22px;
  top: 52px;
  left: 66px;
}

.clouds {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 0px;
  transition: top 0.45s ease-out;
}

.clouds.night {
  top: 125px;
}

.clouds-piece {
  position: absolute;
  height: 100%;
  width: 100%;
}

.clouds-back,
.clouds-front {
  height: inherit;
  width: inherit;
  position: absolute;
}

.clouds-front .clouds-piece {
  background-color: rgb(250, 250, 255);
}

.clouds-front .clouds-piece:nth-child(1) {
  clip-path: ellipse(2.8rem 2.8rem);
  right: -167px;
  top: 7px;
}

.clouds-front .clouds-piece:nth-child(2) {
  clip-path: ellipse(2.8rem 2.8rem);
  right: -145px;
  top: 43px;
}

.clouds-front .clouds-piece:nth-child(3) {
  clip-path: ellipse(2.5rem 2.5rem);
  right: -90px;
  top: 69px;
}

.clouds-front .clouds-piece:nth-child(4) {
  clip-path: ellipse(2rem 2rem);
  right: -50px;
  top: 72px;
}

.clouds-front .clouds-piece:nth-child(5) {
  clip-path: ellipse(2.1rem 2.1rem);
  right: -8px;
  top: 65px;
}

.clouds-front .clouds-piece:nth-child(6) {
  clip-path: ellipse(2.5rem 2.5rem);
  right: 40px;
  top: 80px;
}

.clouds-front .clouds-piece:nth-child(7) {
  clip-path: ellipse(2rem 2rem);
  right: 90px;
  top: 80px;
}

.clouds-back {
  opacity: 0.7;
}

.clouds-back .clouds-piece {
  background-color: rgb(250, 250, 250);
}

.clouds-back .clouds-piece:nth-child(1) {
  clip-path: ellipse(3rem 3rem);
  right: -160px;
  top: -19px;
}

.clouds-back .clouds-piece:nth-child(2) {
  clip-path: ellipse(2rem 2rem);
  right: -108px;
  top: 17px;
}

.clouds-back .clouds-piece:nth-child(3) {
  clip-path: ellipse(2rem 2rem);
  right: -68px;
  top: 26px;
}

.clouds-back .clouds-piece:nth-child(4) {
  clip-path: ellipse(1.5rem 1.5rem);
  right: -35px;
  top: 40px;
}

.clouds-back .clouds-piece:nth-child(5) {
  clip-path: ellipse(2.2rem 2.2rem);
  right: -4px;
  top: 45px;
}

.clouds-back .clouds-piece:nth-child(6) {
  clip-path: ellipse(2rem 2rem);
  right: 45px;
  top: 60px;
}

.clouds-back .clouds-piece:nth-child(7) {
  clip-path: ellipse(2rem 2rem);
  right: 95px;
  top: 70px;
}