escurecer a imagem CSS
.container img {
filter: brightness(50%);
}
Grotesque Gannet
.container img {
filter: brightness(50%);
}#myimage {
filter: brightness(50%);
}#image {
background: linear-gradient( rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5) ), url('landingpagepic.jpg');
}