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<!DOCTYPE html> <html> <head> <title>Input error</title> <link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/> </head> <body> <h1>Inut error</h1> <div> <i class="fa fa-user"></i> <input type="text"> </div> <div> <i class="fa fa-phone"></i> <input type="text"> </div> <div> <i class="fa fa-envelope"></i> <input type="text"> </div> </body> </html>
div { margin: 1em; } div::after { content: "*"; color: #f56161; } input { text-indent: 1.8em; font-family: FontAwesome; caret-color: red; height: 2em; border-radius: 3px; border: 1px solid #bdbcbc; } i { position: absolute; margin: 0.3em 0 0 0.3em; color: #bdbcbc; } /* フォーカスをæŒã¤è¦ç´ ã€ã¾ãŸã¯ãƒ•ã‚©ãƒ¼ã‚«ã‚¹ã‚’æŒã£ãŸåè¦ç´ ã‚’æŒã¤ */ div:focus-within i { color: #f56161; } div:focus-within input { border: 1px solid #f56161; } input:focus { box-shadow: 2px 2px 2px 0 #f56161; } input:focus-visible { outline: none; }