#contenedor_principal{
  position: relative;
  box-sizing: border-box;
  width: 100%;
  margin: 0px;
  padding: 0px;
}

/* Chrome, Safari, Edge, Opera */
#contenedor_principal input::-webkit-outer-spin-button,
#contenedor_principal input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox */
#contenedor_principal input[type=number] {
  -moz-appearance:textfield;
}

#contenedor_principal input:focus,
#contenedor_principal input,
#contenedor_principal select:focus,
#contenedor_principal select,
#contenedor_principal textarea:focus,
#contenedor_principal textarea,
#contenedor_principal button:focus,
#contenedor_principal button{
  outline: none;
  outline-width: 0;
}

#contenedor_principal select::-ms-expand {
  display: none;
}
#contenedor_principal select {
  -webkit-appearance: none;
  -moz-appearance: none;
  text-indent: 1px;
  text-overflow: '';
}