<body>
  
  <div>
    
    <input type="text" id="form" placeholder="Example">
      
      <input type="submit" id="button" value="Enter">
body {
  background: linear-gradient(to left top, #22132e, #000) fixed;
}

div {
  margin: auto;
  position:relative;
  top: 200px;
  width: 40%;
}

#form {
  width: 400px;
  padding: 10px;
  font-size: 18px;
  outline:none;
  background: linear-gradient(to left top, #000, #22132e) fixed;
  border-radius: 10px;
  border: 2px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
  transition: all 0.5s;
}

#form:hover {
  border: 2px solid rgba(255,255,255,0.5);
}
#form:focus {
  border: 2px solid rgba(255,255,255,0.5);
  background: linear-gradient(to left top, #000, #4e2d69) fixed;
}

#button {
  width: 425px;
  padding: 10px;
  margin-top: 10px;
  font-size: 15px;
  font-weight:bold;
  outline:none;
  background: linear-gradient(to left top, #000, #4e2d69) fixed;
  border-radius: 10px;
  border: 5px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
  transition: all 0.5s;
}

#button:hover {
  border: 5px solid rgba(255,255,255,0.5);
  background: linear-gradient(to left top, #000, #8b5db0) fixed;
}

#button:focus {
  background: linear-gradient(to left top, #8b5db0, #000) fixed;
}

External CSS

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External JavaScript

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