Added dark mode for internship html file as this is a seperate file.

Author: Aman-0604

internship.css

@@ -3,7 +3,70 @@
 body{
   background-image: url(./images/Internship\ bg.jpg);
 }
+/* Toggle Switch styling starts here */
+.checkbox {
+  opacity: 0;
+  position: absolute;
+}
+
+.label {
+  width: 44px;
+  height: 20px;
+  background-color:white;
+  border: 0.8px solid #4C4C4C;
+  display: flex;
+  border-radius:50px;
+  align-items: center;
+  justify-content: space-between;
+  padding: 5px;
+  position: relative;
+  transform: scale(1.5);
+}
+
+.ball {
+  width: 14px;
+  height: 14px;
+  background-color: white;
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  border: 1px solid #4C4C4C;
+  border-radius: 50%;
+  transition: transform 0.2s linear;
+}
+
+/*  target the elemenent after the label*/
+.checkbox:checked + .label .ball{
+  transform: translateX(24px);
+}
+
+.bi-moon {
+  color: black;
+}
+
+.bi-sun {
+  color: white;
+}
+/* Toggle Switch styling ends here */
 
+/* dark mode styling starts here */
+.dark-mode{
+  background-color: black;
+  color: white;
+}
+.dark-nav{
+  background-color: black;
+}
+.dark-anchor-tag{
+  color: white;
+}
+.dark-anchor-tag:hover{
+  color: white;
+}
+.dark-card{
+  background-color: #121212;
+}
+/* dark mode styling ends here */
 .back-button {
   text-decoration: none;
   color: rgb(151, 151, 151);
@@ -12,6 +75,7 @@ body{
 /**card styling starts **/
 .internships-card {
   margin-top: 5vh;
+  border-color: #121212;
 }
 
 .company-name {