How to Rotate the Background Image in the Container

How to rotate background keeping container fixed?

If I understood your question properly, you only need to apply transform: rotate on the pseudo-element which has the background and nothing on the container (like in the below snippet).

#myelement {  position: relative;  overflow: hidden;  border: #000000 solid 2px;  width: 100px;  height: 100px;}#myelement:before {  content: "";  position: absolute;  width: 100%;  height: 100%;  top: 0%;  left: 0%;  z-index: -1;  transform: rotate(30deg);  background: url(http://i.stack.imgur.com/lndoe.jpg) 0 0 no-repeat;}

<div id="myelement"></div>

CSS background image w/ rotate, repeat and opacity

You can do it like below:

.background {  height: 500px;  width: 500px;  position: relative;  z-index:0;  display: inline-block;  overflow:hidden; /* hide the overflow here not on the pseudo element */  padding: 100px;  border: black 3px solid;}
.background::before {  content: "";  position: absolute;  z-index: -1;  /* 141% ~ sqrt(2)x100% to make sure to cover all the area after the rotation */  width: 141%;  height:141%;  /**/  /* to center*/  left: 50%;  top: 50%;  /* */  background: url(https://cambridgewords.files.wordpress.com/2019/11/funny.jpg);  background-size: 100px 100px; /* size of the image*/  transform:translate(-50%,-50%) rotate(45deg); /* center the element then rotate */  opacity: 0.5;}

<span class='background'>    HElloWorld  </span>

How to change background image position and rotation in Flutter

You might want to use both the Transform.translate and Transform.rotate to achieve this.

class _WaterIntakeState extends State<WaterIntake>
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Stack(
        children: <Widget>[
          Container(
            color: Colors.white,
          ),
          Transform.translate(
            offset: Offset(-100.0, 200.0),
            child: Transform.rotate(
              angle: pi / 4,
              child: Container(
                decoration: BoxDecoration(
                    image: DecorationImage(
                  colorFilter: ColorFilter.mode(
                      Colors.white.withOpacity(0.5), BlendMode.dstATop),
                  image: AssetImage("assets/images/drink-water.png"),
                  fit: BoxFit.fitWidth,
                )),
              ),
            ),
          ),
          Scaffold(
            backgroundColor: Colors.transparent,
            appBar: AppBar(
              title: Text('Water Intake'),
            ),
            body: Container(
//              child: const ButtonsWidget(),
                ),
          ),
        ],
      ),
    );
  }
}

Ofc you need to play with the offset.

How do I rotate a image background on a select element?

You need to switch from an image to another , rotation is not avalaible for background-image

example

select{  border: 1px solid #ccc;  padding: 5px 35px 5px 5px;  width:150px;  height: 40px;  background-color: #eee;  color: black;  font-size: 16px;  -moz-appearance: none;  -webkit-appearance: none;  appearance: none;  background:  url(data:image/svg+xml;base64,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) 90% / 12% no-repeat #eee ;  }select:focus {background:url(data:image/svg+xml;base64,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) 90% / 12% no-repeat #eee ;

<select>    <optgroup label="Ultra Secret">      <option>007</option>      <option selected>MIB</option>      <option>u mom Alien</option>      <option>no u</option>  </optgroup>    <optgroup label="Something Important">      <option>Item 1</option>      <option>Item 2</option>      <option>Item 3</option>      <option>Item 4</option>      <option>Item 5</option>  </optgroup>
</select>

CSS: background-image rotate without transform: rotate()

To do that, remove the rotation from the CSS of the .bg class and increase its height from 170% to 225%:

.bg {
    background-image: url(http://bagrattam.com/website/images/other/paint.png);
    background-repeat: no-repeat;
    background-size: cover;
    position: absolute;
    top: -50%;
    left: -10%;
    right: -10%;
    height: 225%;
    z-index: -1;
    transform: rotate(0deg);
}

Then use the :after pseudo class to add a rotated overlay over the image which adds the skew effect:

.bg:after {
    content: "";
    font-size: 200px;
    background: #ffffff;
    display: block;
    position: absolute;
    height: 500px;
    left: 0;
    right: 0;
    bottom: -350px;
    transform: rotate(-8deg);
}

Here's what it looks like now:

Sample Image

Hope this helps :)

How do I make the background image to fill the white spaces (on div) while rotating the image CSS or Javascript?

You can try like below:

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width:141vmax;
  height:141vmax;
  background-size: 200px;
  background-image: url(https://as1.ftcdn.net/jpg/00/87/77/88/1000_F_87778829_SUQcfXnnxAvOJDMZBApGuDCh75lb7mIP.jpg);
  transform: rotate(45deg) translateY(-50%);
  transform-origin:top left;
}