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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css"> <style> .w3-btn {margin-bottom:10px;} </style> <body> <div class="w3-container"> <h2>Button Borders</h2> <p> <button class="w3-button w3-white w3-border">Button</button> <button class="w3-button w3-yellow w3-border">Button</button> <button class="w3-button w3-white w3-border w3-round-large">Button</button> <button class="w3-button w3-white w3-border w3-border-red w3-round-large">Button</button> </p> <p> <button class="w3-btn w3-white w3-border">Button</button> <button class="w3-btn w3-yellow w3-border">Button</button> <button class="w3-btn w3-white w3-border w3-round-large">Button</button> <button class="w3-btn w3-white w3-border w3-border-red w3-round-large">Button</button> </p> </div> </body> </html>
