style.css

/* default styling variables - making background color as white */
html{
    --bg: #fff;
    --bg-panel: #ebebeb;
    --color-heading: rgb(27, 168, 14); 
    --color-text: #333333;
    
}

/* dark theme styling - Here, we set data-them as "dark"*/
html[data-theme='dark'] {
    --bg: #333333;
    --bg-panel: #434343;
    --color-heading: #0077ff; 
    --color-text: #B5B5B5;
    
}


body { 
    background-color: var(--bg); /* background color variable */
    transition: 1s;
}

.container {
  background-color: var(--bg-panel); /* background panel color variable */
  margin: 5em;
  padding: 5em;
  border-radius: 15px;
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 80% auto;
      grid-template-columns: 80% auto;
  -ms-grid-rows: auto auto;
      grid-template-rows: auto auto;
      grid-template-areas: "title switch"
 "content content";
}

.container h1 {
  margin: 0;
  color: var(--color-heading); /* heading 1 background color variable */
}

.container p {
  color: var(--color-text); /* text-color variable */
  -ms-grid-column-span: 2;
  grid-area: content;
  font-size: 1.1em;
  line-height: 1.8em;
  margin-top: 2em;
}

input[type=checkbox] { /* styling for input element */
  height: 0;
  width: 0;
  visibility: hidden;
}

label { /* styling for labels */
  cursor: pointer;
  text-indent: -9999px;
  width: 52px;
  height: 27px;
  background: #1ba80e;
  float: right;
  border-radius: 100px;
  position: relative;
}

label:after { /* styling for labels - on toggle */
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 90px;
  -webkit-transition: 0.3s;
  transition: 0.3s;
}

input:checked + label { /* conditional check while toggling */
  background: var(--color-heading);
}

input:checked + label:after {
  left: calc(100% - 5px);
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
}

label:active:after {
  width: 45px;
}

.toggle-container{
  display: flex;
  justify-content: center;
  align-items: center;
}

.sun{
  margin-right: 1rem;
}
.moon{
  margin-left: 1rem;
}