/* CSS reset  */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 5px;
  background: url("../img/morning.png") no-repeat center/cover;
  transition: background 0.8s;
}

body.change {
  background: url("../img/night.png") no-repeat center/cover;
}

.circle_wrapper {
  position: relative;
  width: 100%;
  height: 150px;
  max-width: 375px;
  border: 1px solid white;
  border-radius: 100px;
  backdrop-filter: blur(10px);
}

.circle__child {
  width: 100%;
  height: 140px;
  max-width: 140px;
  background: url("../img/morning.png") no-repeat center/cover;
  cursor: pointer;
  border-radius: 50%;
  transform: translateY(-50%);
  transition: left 0.8s, background 0.8s;
  position: absolute;
  top: 50%;
  left: 1%;
}

.circle__child.active {
  left: 61%;
  background: url("../img/night.png") no-repeat center/cover;
}