#solar-calculator-form label {
  display: block;
  margin: 10px 0 4px;
  font-weight: bold;
}
#solar-calculator-form input,
#solar-calculator-form select {
  width: 100%;
  padding: 8px;
  box-sizing: border-box;
}
#solar-calculator-form button {
  margin-top: 15px;
  padding: 10px 20px;
  font-size: 1rem;
  cursor: pointer;
}
.threecolumn {
  float: left;
  width: 33.33%;
}

.twocolumn {
  float: left;
  width: 50%;
  background: #333;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}