form {
  margin: 0 auto;
  width: 50%;
}

fieldset {
border: 2px solid black; 
margin-bottom: 20px;
}

legend {
  font-weight: bold;
}

label {
  display: inline-block;
  width: 170px;
  margin-bottom: 30px;
	font-weight: bold;
}

input[type="number"],
select {
  width: 215px;
  padding: 5px;
  border-radius: 5px;
  border: 1px solid #ccc;
  margin-bottom: 10px;
}


button:hover {
  opacity: 0.8;
}

#voltage-type, #power-factor {
  display: none;
}

button[type="button"] {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 5px;
}

button[type="reset"] {
  background-color: #f44336;
  color: white;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  border-radius: 4px;
}

.button-container {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

 #output {
        margin-top: 20px;
        font-size: 18px;
        font-weight: bold;
	      color: red;
      }

.formula {
    font-family: times new roman;
    font-size: 1.6em;
    padding-left: 6px;
    font-weight: 400;
}

/* For screens smaller than 600px */
@media (max-width: 600px) {
  body {
    font-size: 14px;
  }
  form {
    width: 90%;
    margin: 0 auto;
  }
  input[type="number"], select {
    width: 100%;
    margin: 10px 0;
  }
  label {
    font-size: 16px;
  }
  button[type="button"], button[type="reset"] {
    margin-top: 20px;
    width: 100%;
		padding: 10px 20px;
  }
}

/* For screens between 600px and 900px */
@media (min-width: 600px) and (max-width: 900px) {
  body {
    font-size: 16px;
  }
  form {
    width: 80%;
    margin: 0 auto;
  }
  label {
    font-size: 18px;
  }
}

/* For screens larger than 900px */
@media (min-width: 900px) {
  body {
    font-size: 18px;
  }
  form {
    width: 60%;
    margin: 0 auto;
  }
  label {
    font-size: 20px;
  }
}