.caja-azul {
  width: 300px;
  height: 100px;
  border: 1px solid blue;
}

.caja-roja {
  width: 300px;
  height: 100px;
  padding: 50px;
  border: 1px solid red;
}

.caja-azul1 {
  width: 300px;
  height: 100px;
  border: 1px solid blue;
  box-sizing: border-box;
}

.caja-roja1 {
  width: 300px;
  height: 100px;
  padding: 50px;
  border: 1px solid red;
  box-sizing: border-box;
}

/* Aplicar box-sizing a todos los elementos */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  padding: 20px;
}

/* Estilos para el formulario */
.formulario-contacto {
  max-width: 500px;
  margin: auto;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  margin-bottom: 15px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

/* Estilo del botón de envío */
input[type="submit"] {
  background-color: #4caf50;
  color: white;
  padding: 10px 15px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

input[type="submit"]:hover {
  background-color: #45a049;
}