Play the following css in the image div:
.imagem{
width: 100%;
height: 100vh;
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}
Width 100% will make the image take the entire width of the screen, the height 100vh, will make it will be caught the entire height of the screen, regardless of size, 100vh, are 100 points of the screen, if you have questions about vh Click here.
Background-size cover will make the image fit the inserted size, background position center will keep it in the middle of the screen and the background-repeat will make the image not repeat, is displayed only once.
Remembering that the image should be in the background, example:
<div class="imagem" style="background-image: url(localimagem/imagem.jpg);"></div>
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