CSS Property: transform-origin

The transform-origin property allows us to change the position of transformed elements. 2D transformations can change the x and y axis of an element, while 3D transformations can also change the z axis. This property must be used together with the transform property.

EXAMPLE

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>transform-origin</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

    <style>
        * {
            box-sizing: border-box;
        }

        .container {
            color: #333333;
            margin: 20px;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: #f9f9f9;
        }

        .demo-box {
            width: 200px;
            height: 100px;
            margin: 30px;
            background: linear-gradient(45deg, #ff8c00, #ff4500);
            color: white;
            display: inline-block;
            transition: transform 0.5s ease;
            position: relative;
            cursor: pointer;
            border-radius: 5px;
        }

        .rotation-point {
            position: absolute;
            width: 10px;
            height: 10px;
            background: red;
            border-radius: 50%;
            z-index: 2;
        }

        /* Different rotation points */
        .example-center {
            transform-origin: center;
        }
        .example-center .rotation-point {
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }

        .example-top-left {
            transform-origin: left top;
        }
        .example-top-left .rotation-point {
            left: 0;
            top: 0;
        }

        .example-bottom-right {
            transform-origin: right bottom;
        }
        .example-bottom-right .rotation-point {
            right: 0;
            bottom: 0;
        }

        .example-percentage {
            transform-origin: 75% 25%;
        }
        .example-percentage .rotation-point {
            left: 75%;
            top: 25%;
            transform: translate(-50%, -50%);
        }

        /* Hover effects */
        .demo-box:hover {
            transform: rotate(45deg);
        }

        .description {
            font-size: 14px;
            color: #666;
            margin: 10px 0;
        }

        .instruction {
            background-color: #e9ecef;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="instruction">
            <strong>Instruction:</strong> Hover over the element to see the rotation. 
            The red dot indicates the rotation point (transform-origin).
        </div>

        <h3>Center point (transform-origin: center)</h3>
        <div class="demo-box example-center">
            <div class="rotation-point"></div>
            <div class="content">Rotation around center</div>
        </div>
        <div class="description">Element rotates around its center point</div>

        <h3>Top left corner (transform-origin: left top)</h3>
        <div class="demo-box example-top-left">
            <div class="rotation-point"></div>
            <div class="content">Rotation around top left corner</div>
        </div>
        <div class="description">Element rotates around its top left corner</div>

        <h3>Bottom right corner (transform-origin: right bottom)</h3>
        <div class="demo-box example-bottom-right">
            <div class="rotation-point"></div>
            <div class="content">Rotation around bottom right corner</div>
        </div>
        <div class="description">Element rotates around its bottom right corner</div>

        <h3>Percentage (transform-origin: 75% 25%)</h3>
        <div class="demo-box example-percentage">
            <div class="rotation-point"></div>
            <div class="content">Rotation around point 75% 25%</div>
        </div>
        <div class="description">Element rotates around a point 75% from left and 25% from top</div>
    </div>
</body>
</html>

RESULT