.simple-interest {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  margin: 0;
  padding: 2.5rem;
  background-color: whitesmoke;
  border-radius: 0.3125rem;
  box-shadow: 0 0 1.875rem rgba(0, 0, 0, 0.3);
}

.simple-interest h2 {
  margin: 0 0 1.875rem;
  padding: 0 0 0.9375rem;
  border-bottom: 0.0625rem solid #ddd;
  font-size: 1.25rem;
  font-weight: bold;
  text-align: center;
}

.simple-interest .error {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 0 0 1.25rem;
  padding: 0.625rem;
  background-color: rgba(231, 76, 60, 0.7);
  border: 0.125rem solid #e74c3c;
  border-radius: 0.625rem;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 400;
}

.simple-interest .error.hide {
  display: none;
}

.simple-interest form {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.simple-interest form label {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin: 0 0 0.625rem;
  background: white;
  border: 0.0625rem solid slategray;
}

.simple-interest form label > span {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 15%;
  padding: 0.625rem 0.3125rem;
  background-color: slategray;
  color: white;
  font-weight: bold;
}

.simple-interest form label input {
  position: relative;
  display: flex;
  width: 85%;
  margin: 0;
  padding: 0.625rem 0.3125rem 0.625rem 0.75rem;
  background: transparent;
  border: none;
  font-size: 0.75rem;
  font-weight: 300;
}

.simple-interest .button {
  position: relative;
  width: 100%;
  height: 33px;
  margin: 0.5rem 0 0;
  padding: 0;
  background-color: rgba(112, 128, 144, 0.9);
  border: none;
  border-radius: 0.3125rem;
  color: white;
  font-size: 0.75rem;
  font-weight: 300;
  text-transform: uppercase;
  transition: 0.25s;
  overflow: hidden;
}

.simple-interest .button:before {
  content: 'Calculate';
  display: flex;
  align-items: center;
  justify-content: center;
}

.simple-interest .button.loading:before,
.simple-interest .button.loading:after {
  position: absolute;
  top: 0;
  left: 0;
}

.simple-interest .button.loading:before {
  content: 'LOADING';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: whitesmoke;
  font-size: 0.75rem;
  font-weight: bold;
  z-index: 1;
}

.simple-interest .button.loading:after {
  content: '';
  width: 0%;
  height: 100%;
  background-color: #2ecc71;
  animation: loading 2s ease;
  z-index: 0;
}

@keyframes loading {
  100% {
    width: 100%;
  }
}

.simple-interest .button:hover {
  background-color: slategray;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}

.simple-interest .results {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 1.25rem 0 0;
  padding: 0;
}

.simple-interest .results.hide {
  display: none;
}

.simple-interest .results .monthly-payment,
.simple-interest .results .total-interest,
.simple-interest .results .total-amount {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 0.3125rem;
}

.simple-interest .results .monthly-payment > span,
.simple-interest .results .total-interest > span,
.simple-interest .results .total-amount > span {
  position: relative;
  display: flex;
  align-items: center;
  height: 1.75rem;
  padding: 0.3125rem 0.625rem;
  border: 0.0625rem solid #3498db;
  font-size: 0.75rem;
}

.simple-interest .results .monthly-payment > span:first-child,
.simple-interest .results .total-interest > span:first-child,
.simple-interest .results .total-amount > span:first-child {
  justify-content: flex-start;
  width: 40%;
  margin: 0;
  background-color: #3498db;
  color: white;
}

.simple-interest .results .monthly-payment > span:last-child,
.simple-interest .results .total-interest > span:last-child,
.simple-interest .results .total-amount > span:last-child {
  justify-content: flex-end;
  width: 60%;
  margin: 0;
  background-color: white;
  font-weight: 600;
}