extension.css

.body {
  align-items: center;
  font-family: 'Ubuntu', serif, Calibri;
}
@font-face{
  font-family: "Ubuntu";
  src: url('fonts/Ubuntu-Medium.ttf')
}
.box{
  font-family: 'Ubuntu', serif, Calibri;
}
.kagi {
  background: #063ef7;
  border: 0;
  color: #f5f6fa;
  padding: 12px 48px;
  font-size: 18px;
  margin-bottom: 16px;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Ubuntu', Times, serif;
}
.dark-mode {
  background-color: black;
  color: white;
}
.searchBox {
  position: absolute;
  top: 50%;
  left: 50%;
  transform:  translate(-50%,50%);
  background: #2f3640;
  height: 40px;
  border-radius: 40px;
  padding: 10px;

}

.searchBox:hover > .searchInput {
  width: 240px;
  padding: 0 6px;
}

.searchBox:hover > .searchButton {
background: white;
color : #2f3640;
}

.searchButton {
  color: white;
  float: right;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #2f3640;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: 0.4s;
}

.searchInput {
  border:none;
  background: none;
  outline:none;
  float:left;
  padding: 0;
  color: white;
  font-size: 16px;
  transition: 0.4s;
  line-height: 40px;
  width: 0px;

}

@media screen and (max-width: 620px) {
.searchBox:hover > .searchInput {
  width: 150px;
  padding: 0 6px;
}
}