.required:before {
  content: "*";
  display: inline-block;
  top: 0;
  margin-left: -0.5rem;
  margin-right: 0.25rem;
  color: #dc3545;
}

.calc-section {
  background-color: #e9ecef;
  border-radius: 0.3rem;
  border: 1px solid rgba(0, 0, 0, 0.125);
}

#calculator legend {
  font-size: 1.1rem;
  font-weight: 600;
  padding-top: 1.5rem;
  text-align: center;
  margin-bottom: 1rem;
}

#calculator ul {
  list-style: none;
  padding-left: 0;
  margin-left: 2rem;
  margin-right: 2rem;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

#calculator ul > li {
  margin-bottom: 1.5rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}

#calculator ul > li > input {
  margin-right: 0.5rem;
  margin-left: 0.5rem;
}

#calculator ul > li > select {
  margin-left: 0.5rem;
}

.calc-button {
  text-align: center;
  padding-top: 0.5rem;
  padding-bottom: 2rem;
  margin-left: 2rem;
}

#voltageResults {
  background-color: #e4ecf9;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(0, 0, 0, 0.125);
}

.result-drop {
  color: rgb(180, 28, 42);
  text-transform: uppercase;
  font-weight: bolder;
  font-size: 1.25rem;
}

.result-out {
  color: rgb(5, 98, 5);
  text-transform: uppercase;
  font-weight: bolder;
  font-size: 1.25rem;
}

.result-loss {
  color: rgb(14,32,70);
  text-transform: uppercase;
  font-weight: bolder;
  font-size: 1.25rem;
}

.result-value {
  font-size: 2.5rem;
  font-weight: bolder;
}

.invalid-feedback {
    text-align: left !important;
    margin-left: 0.75rem;
}

@media (max-width: 767.98px) {
  .calc-button {
    margin-right: 2.5rem;
  }
  #calculator ul > li > label {
    text-align: left;
  }
  .drop-column {
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
    padding-bottom: 1.5rem;
  }
}
@media (min-width: 768px) {
  #calculator ul > li {
    margin-right: auto;
    margin-left: auto;
  }
  #calculator ul > li > label {
    text-align: right;
  }
  #calculator ul > li > input {
    margin-left: 1rem;
  }
  #calculator ul > li > select {
    margin-left: 1rem;
  }
}
@media (min-width: 768px) and (max-width: 1199.95px) {
  .invalid-feedback {
    margin-left: 15.5rem;
  }
}
@media (min-width: 1200px) and (max-width: 1349.95px) {
  .calc-button {
    margin-left: 0.75rem;
  }
  .invalid-feedback {
    margin-left: 19rem;
  }
}
@media (min-width: 1350px) and (max-width: 1599.95px) {
  .calc-button {
    margin-left: -0.5rem;
  }
  .invalid-feedback {
    margin-left: 14.5rem;
  }
}
@media (min-width: 1600px) {
  .invalid-feedback {
    margin-left: 15.25rem;
  }
  .calc-button {
    margin-left: 2.25rem;
  }
}