Positioning the box at the exact middle of the screen

I'm trying to center an item on the screen using material ui, but it's appearing at the top instead of the middle. How can I fix this?

import * as React from 'react';
import Box, { BoxProps } from '@mui/material/Box';

function Item(props: BoxProps) {
  const { sx, ...other } = props;
  return (
    <Box
      sx={{
        p: 1,
        m: 1,
        bgcolor: (theme) => (theme.palette.mode === 'dark' ? '#101010' : 'grey.100'),
        color: (theme) => (theme.palette.mode === 'dark' ? 'grey.300' : 'grey.800'),
        border: '1px solid',
        borderColor: (theme) =>
          theme.palette.mode === 'dark' ? 'grey.800' : 'grey.300',
        borderRadius: 2,
        fontSize: '0.875rem',
        fontWeight: '700',
        ...sx,
      }}
      {...other}
    />
  );
}

export default function JustifyContent() {
  return (
    <div style={{ width: '100%', height:'100%'}}>
      <Box
        sx={{
          display: 'flex',
          justifyContent: 'center',
          textAlign:'center',
          p: 1,
          m: 1,
          bgcolor: 'background.paper',
          borderRadius: 1,
        }}
      >
        <Item>Item 1</Item>
     
      </Box>
     
    </div>
  );
}

What am I doing wrong in my code?

cssreactjstypescriptmaterial-ui

Answer №1

Ensure your content wrapper spans the entire viewport for proper display. Currently, it lacks height due to its parent element being heightless.

Revise it as follows:

    <div style={{ width: '100vw', height:'100vh', display: 'flex', justifyContent: 'center', alignItems: 'center'}}>

Once updated, it will be horizontally and vertically centered on the screen.

Answer №2

To ensure the content is always centered on the screen, regardless of screen height, add a minimum height of 100vh.

 <Box
        sx={{
          display: "flex",
          justifyContent: "center",
          alignItems: "center",
          minHeight: "100vh",
          p: 1,
          m: 1,
          bgcolor: "background.paper",
          borderRadius: 1
        }}
      >
        <Item>Item 1</Item>
      </Box>

Answer №3

Give this a shot.

<div style={{ 
     width: '100%', 
     height:'100vh', 
     display: 'flex',
     justifyContent: 'center',
     alignItems: 'center'
     }}>

      <Box
        sx={{
          display: 'flex',
          justifyContent: 'center',
          textAlign:'center',
          p: 1,
          m: 1,
          bgcolor: 'background.paper',
          borderRadius: 1,
        }}
      >
        <Item>Item 1</Item>
     
      </Box>
     
    </div>

If you want an element to be centered, make sure its immediate parent has the necessary styling to bring it to the center.

To debug:

  1. Check the box model for the target element by inspecting the page.
  2. Add temporary properties like display: flex;, justify-content: center;, align-items: center;, and height: 100vh; to its wrapper/immediate parent.

Remember to provide a height to the parent element when adding these properties.

Apply the mentioned properties to the wrapper of the element you wish to center.

For better understanding, see the example below.

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100vh;
}

.parent {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.child {
  height: 100px;
  width: 100px;
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
}
<!DOCTYPE html>
<html lang="en>
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE-edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="styles.css" />
    <title>Document</title>
  </head>
  <body>
    <div class="parent">
      <div class="child">Item 1</div>
    </div>
  </body>
</html>

In the provided example, I centered the text 'Item 1' by applying the necessary properties to the div with the child class. Similarly, you can center the child div by styling the parent div accordingly.

Use this reference to troubleshoot and ensure you understand the process thoroughly for future use.

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