styles.css

body {
    font-family: Arial, sans-serif;
    color: #fff;
    margin: 0;
    padding: 0;
    height: 100vh;
    background: -webkit-linear-gradient(top, #1D24CA, #98ABEE);
    background: -moz-linear-gradient(top, #1D24CA, #98ABEE);
    background: -o-linear-gradient(top, #1D24CA, #98ABEE);
    background: linear-gradient(to bottom, #1D24CA, #98ABEE);
}


.wrapper {
  position: relative;
  width: 300px;
  height: 360px;
  border-radius: 8px;
  margin: 50px auto;
  background-color: rgba(255, 255, 255, 0.007);
  box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.356);
}

.calculator {
  padding: 10px;
  border-radius: 8px;
  background-size: cover;
  background-color: rgba(255, 255, 255, 0.014);
  box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

#display {
  width: 93.3%;
  padding: 10px;
  margin-bottom: 10px;  
  margin-bottom: 10px;
  border: none;
  border-radius: 7px 7px 0px 0px;
  font-size: 24px;
  text-align: right;
  background-color: rgba(255, 255, 255, 0.096);
  color: #fff;
  outline: none;
}

.keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

button {
  padding: 13px;
  font-size: 20px;
  border: none;
  border-radius: 4px;
  background-color: rgba(255, 255, 255, 0.096);
  color: #fff;
  box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #444;
}

.nugrah {
  width: 330px;
  height: auto;
  margin: 10px auto;
  border-radius: 8px;

}

.nugrah h1 {
  text-align: center;
  color: #fff;
  font-size: 13px;
  font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
  display: block;
}