The shape-outside CSS property defines a shape—which may be non-rectangular—around which adjacent inline content should wrap. By default, inline content wraps around its margin box; shape-outside provides a way to customise this wrapping, making it possible to wrap text around complex objects rather than simple boxes.
/* Keyword values */
shape-outside: none;
shape-outside: margin-box;
shape-outside: content-box;
shape-outside: border-box;
shape-outside: padding-box;
/* Function values */
shape-outside: circle();
shape-outside: ellipse();
shape-outside: inset(10px 10px 10px 10px);
shape-outside: polygon(10px 10px, 20px 20px, 30px 30px);
shape-outside: path('M0.5,1 C0.5,1,0,0.7,0,0.3 A0.25,0.25,1,1,1,0.5,0.3 A0.25,0.25,1,1,1,1,0.3 C1,0.7,0.5,1,0.5,1 Z');
/* <url> value */
shape-outside: url(image.png); /* This is a transparent background image */
/* <gradient> value */
shape-outside: linear-gradient(45deg, rgba(255, 255, 255, 0) 150px, red 150px);
/* Global values */
shape-outside: initial;
shape-outside: inherit;
shape-outside: unset;Source: https://developer.mozilla.org/en-US/docs/Web/CSS/shape-outside