Flexbox

Use the colors that were given in the styleguide.md found in the zip folder you downloaded.

There is no need to give the main a width and height value .

There is no need to give .contenedor-central a height value rather give .contenedor-izquierdo a padding value for all the sides, this will prevent the content from overflowing on smaller screens.

For the color of th image add mix blend-mode: multiply, object-fit: cover and opacity:0.8 to the img

img{
width: 100%;
height: 100%;
object-fit: cover;
mix-blend-mode: multiply;
opacity: 0.8;
}

Use relative units like rem or em as unit for the padding, margin, width values and preferably rem for the font-size values, instead of using px which is an absolute unit. For more on CSS units Click here

Hope am helpful.

Well done for completing this challenge. HAPPY CODING