MaterialUI Box reigns supreme in the realm of background images

Question

MaterialUI Box reigns supreme in the realm of background images

In my React component, I have a form that is structured like this:

<Box
      display="flex"
      justifyContent="center"
      alignItems="center"
      style={{ minHeight: "100vh", backgroundColor: "gray", opacity: "0.8" }}
    > ...
</Box>

This form component, named Form, is then included in App.js in the following way:

import React from "react";
import Form from "./components/Form";

const sectionStyle = {
  height: "100vh",
  backgroundImage:
    "url('www.blablabla.com/img.jpg') ",
  backgroundRepeat: "no-repeat",
  backgroundSize: "cover"
};

const App = () => {
  return (
    <div style={sectionStyle}>
      <Form />
    </div>
  );
};
export default App;

However, the output I get looks like this:

https://i.sstatic.net/1jENj.jpg

I used opacity to emphasize that my Box component is covering the entire window, whereas I want it to only wrap around its content. This way, if opacity is applied, it will only affect the inside of the Box, while the background image remains unaffected.

Is there a way for me to achieve this?

css reactjs material-ui

Answer 1

Answer №1

material-ui Box's default component is a div. For more information, visit material-ui Box

A div typically stretches horizontally by default to fill the available space. This explains why your Box is stretching horizontally. To learn more about how the default size of a div element is determined or calculated, check out this resource: Where is the default size of a div element defined or calculated?

The minHeight: "100vh" style applied to the Box instructs it to stretch vertically across the available space. Consequently, your Box is stretching vertically. For a fun exploration of viewport units, see: Fun with Viewport Units

If you're looking for a different layout, consider using the Grid component as a wrapper. Here's an example:

   <Grid container className={props.classes.sectionStyle}
                          direction="column"
                          justify="space-evenly"
                          alignItems="center"
   >
       <Grid item>
           <Form />
       </Grid>
   </Grid>

To implement this change in your code, you can do the following:

import React from "react";
import {Grid} from '@material-ui/core';
import Form from "./components/Form";

const sectionStyle = {
  height: "100vh",
  backgroundImage: "url('www.blablabla.com/img.jpg') ",
  backgroundRepeat: "no-repeat",
  backgroundSize: "cover"
};

const App = () => {
  return (
    <Grid style={sectionStyle}
        container
        direction="column"
        justify="space-evenly"
        alignItems="center"
    >
      <Grid item>
        <Form />
      </Grid>
    </Grid>
  );
};
export default App;

Answer 2

material-ui Box's default component is a div. For more information, visit material-ui Box

A div typically stretches horizontally by default to fill the available space. This explains why your Box is stretching horizontally. To learn more about how the default size of a div element is determined or calculated, check out this resource: Where is the default size of a div element defined or calculated?

The minHeight: "100vh" style applied to the Box instructs it to stretch vertically across the available space. Consequently, your Box is stretching vertically. For a fun exploration of viewport units, see: Fun with Viewport Units

If you're looking for a different layout, consider using the Grid component as a wrapper. Here's an example:

   <Grid container className={props.classes.sectionStyle}
                          direction="column"
                          justify="space-evenly"
                          alignItems="center"
   >
       <Grid item>
           <Form />
       </Grid>
   </Grid>

To implement this change in your code, you can do the following:

import React from "react";
import {Grid} from '@material-ui/core';
import Form from "./components/Form";

const sectionStyle = {
  height: "100vh",
  backgroundImage: "url('www.blablabla.com/img.jpg') ",
  backgroundRepeat: "no-repeat",
  backgroundSize: "cover"
};

const App = () => {
  return (
    <Grid style={sectionStyle}
        container
        direction="column"
        justify="space-evenly"
        alignItems="center"
    >
      <Grid item>
        <Form />
      </Grid>
    </Grid>
  );
};
export default App;

Answer 3

Answer №2

If you are looking for a solution, my suggestion would be to utilize pseudo-elements like :after and :before

Take a look at this example.

.background-filter::after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: .8;
    background: red;
}

.background-filter {
  position: relative;
}

.background {
  background-image: url('https://upload.wikimedia.org/wikipedia/en/6/62/Kermit_the_Frog.jpg');
  width: 200px;
  height: 200px;
}
.background span{
position: absolute;
    z-index: 1;
    }

<div class="background background-filter"><span>Hello World I am text with background blur</span></div>

The changes made to ::after will not impact the form above

Answer 4

If you are looking for a solution, my suggestion would be to utilize pseudo-elements like :after and :before

Take a look at this example.

.background-filter::after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: .8;
    background: red;
}

.background-filter {
  position: relative;
}

.background {
  background-image: url('https://upload.wikimedia.org/wikipedia/en/6/62/Kermit_the_Frog.jpg');
  width: 200px;
  height: 200px;
}
.background span{
position: absolute;
    z-index: 1;
    }

<div class="background background-filter"><span>Hello World I am text with background blur</span></div>

The changes made to ::after will not impact the form above

MaterialUI Box reigns supreme in the realm of background images

Answer №1

Answer №2

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