#cpn-cont {
  max-width: 400px;
}
#cpn-cont h2 {
  margin-bottom: 1em;
}

/* Fila doble */
.cpn-cont-row {
  margin-bottom: 1em;
}
.cpn-cont-row input {
  width: 48%;
  display: inline-block;
  margin-right: 4%;
  box-sizing: border-box;
  padding: 0.5em;
}
.cpn-cont-row input:last-child {
  margin-right: 0;
}

/* Inputs y textarea */
#cpn-cont input,
#cpn-cont textarea {
  width: 100%;
  padding: 0.5em;
  margin-bottom: 0.75em;
  box-sizing: border-box;
}

/* Botón */
#cont-btn-send {
  padding: 0.5em 1em;
  cursor: pointer;
}

/* Mensaje */
#cont-msg {
  margin-top: 1em;
  color: #a00;
}