.caixa-input {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    box-sizing: border-box;
    border: 1px solid #754671;
    border-radius: 4px;
    font-size: 16px;
    background-color: rgba(125, 15, 255, 0.1);
}
input::placeholder {
  color: rgba(255, 255, 255, 0.75);
  opacity: 0.75; /* Necessário para Firefox, que coloca transparência padrão */
}

/* Chrome, Safari, Edge, Opera */
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
}

/* Firefox */
input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
  color: rgba(255, 255, 255, 0.75);
}

.botao-calcular {
    background-color: #42184e;
    color: rgba(255, 255, 255, 0.562);
    padding: 10px 20px;
    border: 1px solid #754671;
    border-radius: 2px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
}
.botao-calcular:hover {
    background-color: #754671;
    color: rgba(255, 255, 255, 0.75);
}