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Multi line padded text with outer and inner rounded corners in CSS

I would like to create multi line padded text with outer and inner rounded corners in CSS, as seen in the image below. There are many solutions for outer corners, but inner corners (marked with red arrows in the image) seems much more complicated. Perhaps there needs to be some javascript?

enter image description here

Solution

  • This is, for me, a really good answer. Code by https://stackoverflow.com/users/6400719/ines-montani

    HTML:

    <div class="edit">Edit text below</div>

<h1>
    <div class="goo" contenteditable="true">This is an example of a simple headline or text with rounded corners using<br>a gooey SVG filter.</div>
</h1>

<!-- Filter: https://css-tricks.com/gooey-effect/ -->
<svg style="visibility: hidden; position: absolute;" width="0" height="0" xmlns="http://www.w3.org/2000/svg" version="1.1">
    <defs>
        <filter id="goo"><feGaussianBlur in="SourceGraphic" stdDeviation="10" result="blur" />    
            <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 19 -9" result="goo" />
            <feComposite in="SourceGraphic" in2="goo" operator="atop"/>
        </filter>
    </defs>
</svg>

    CSS:

    :root {
    --color-bg: #34304c;
    --color-bg2: #534d7a;
    --color-highlight: #fff;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

.goo {
    font-size: 3rem;
    line-height: 1.35;
    display: inline;
    box-decoration-break: clone;
    background: var(--color-highlight);
    padding: 0.5rem 1rem;
    filter: url('#goo');
}

.goo:focus {
    outline: 0;
}

.edit {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-bg2);
    text-transform: uppercase;
    font-size: 0.7rem;
    color: var(--color-highlight);
    border-radius: 1em;
}

body {
    padding: 7.5vh 100px 0 100px;
    font-family: var(--font);
    background: var(--color-bg);
}

    enter image description here

    Link to Codepen: https://codepen.io/ines/pen/NXbmRO