style.css

@import url(https://fonts.googleapis.com/css?family=Open+Sans);
.centerimghome {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: max-width;
    border-radius: 200px;
    -webkit-user-select: none;
    user-select: none;
}
.btn-blue {
  background-color: #008CBA;
  border-radius: 100px;
  color: white;
  padding: 10px 15px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
}
.topnav {
    overflow: hidden;
}
.topnav a {
  float: right;
  display: block;
  color: black;
  text-align: none;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  font-family: "Roboto";
  -webkit-user-select: none;
  user-select: none;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
  font-family: "Roboto";
}

.topnav a.active {
  background-color: #2196F3;
  color: white;
  font-family: "Roboto";
}
* {
  box-sizing: border-box;
}

form.searchboxhome input[type=text] {
  padding: 10px;
  font-size: 17px;
  border: none;
  float: left;
  width: 80%;
  background: #f1f1f1;
  text-align: center;
  border-radius: 25px;
  -webkit-user-select: none;
  user-select: none;
}

form.searchboxhome button {
  float: left;
  width: 20%;
  padding: 10px;
  background: #2196F3;
  color: white;
  font-size: 17px;
  border: none;
  border-left: none;
  cursor: pointer;
  border-radius: 25px;
}

form.searchboxhome button:hover {
  background: #0b7dda;
  border-radius: 25px;
}

form.searchboxhome::after {
  content: "";
  clear: both;
  display: table;
  border-radius: 25px;
}
.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: rgba(14, 15, 36, 0.865);
  color: white;
  text-align: right;
}
.dark-theme{
  background-color: #15181f;
  color: #e5e5e5;
}
.dark-theme .topnav a{
  float: right;
  display: block;
  color: white;
  text-align: none;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
  font-family: "Roboto";
}
.dark-theme .topnav a:hover {
  background-color: rgba(255, 255, 255, 0.349);
  color: white;
  font-family: "Roboto";
}
.dark-theme #toggle{
  background-color: #ffffff;
}
.dark-theme #toggle:after{
  background-color: transparent;
  box-shadow: 10px 10px #15181f;
  top: -4px;
  left: 30px;
}
.dark-theme .topnav a.active {
  background-color: #2196F3;
  color: white;
  font-family: "Roboto";
}
#toggle{
  -webkit-appearance: none;
  appearance: none;
  height: 40px;
  width: 75px;
  background-color: #15181f;
  position: absolute;
  border-radius: 20px;
  outline: none;
  cursor: pointer;
}
#toggle:after{
  content: "";
  position: absolute;
  height: 30px;
  width: 30px;
  background-color: #ffffff;
  top: 5px;
  left: 7px;
  border-radius: 50%;
}
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: center;
  border-radius: 25px;
  background-color: #f6f6f6;
  min-width: 230px;
  border: 1px solid #ddd;
  z-index: 1;
  font-family: "Roboto";
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  -webkit-user-select: none;
  user-select: none;
}

.dropdown-content a:hover {background-color: #f1f1f1;border-radius: 25px;}

.show {display:block;}

.footerdropbtn {
  background-color: #5170b2;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
  cursor: pointer;
  border-radius: 25px;
}

.footerdropdown {
  position: relative;
  display: inline-block;
}

.footerdropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.footerdropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  -webkit-user-select: none;
  user-select: none;
  font-family: "Roboto";
}

.footerdropdown-content a:hover {background-color: #f1f1f1}

.footerdropdown:hover .footerdropdown-content {
  display: block;
}

.footerdropdown:hover .footerdropbtn {
  background-color: #5170b2;
}