<form id="searchform">
  <input type="text" id="search" required placeholder="Search Your File">
  <input type="submit" id="submit" value="Search">
  </form>

/* Css By WeBMasTeR5 */
body {
  font-family: arial;
}
#searchform {
  border: 1px;
  border-width: 1px;
  padding: 10px;
  border-style: solid;
  border-radius: 30px;
  width: 500px;
  background: #ff0d00;
  color: #d6fff8;
  box-shadow: 0px 1px 3px rgba(0,0,0,2) inset;
}
#search {
  padding: 5px 9px;
  border-radius: 30px;  
  box-shadow: 0px 1px 3px rgba(0,0,0,2) inset;
  background: white;
  color: red;
  line-height: 25px;
  width: 380px;
  text-align: center;
  font-size: 14px;
  border-style: 1px solid red;
  border-width: 1px;
}
#submit {
  border-radius: 35px 5px 35px 5px;
  background: red;
  color: white;
  box-shadow: 0px 1px 3px rgba (0,0,0,2) inset;
  width: 100px;
  cursor: pointer;
}