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<html><head><style> #myDIV { margin-top: 20px; inline-size: 70%; block-size: 200px; background-color: lightgreen; border-block: 1px solid black;}</style></head><body><h1>Change border-block with JavaScript</h1><p>Click the "Try it" button to change the border-block property of the DIV element:</p><button onclick="myFunction()">Try it</button><div id="myDIV"> <h1>Hello</h1></div><script>function myFunction() { document.getElementById("myDIV").style.borderBlock = "dashed hotpink 10px";}</script></body></html>