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html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://fonts.googleapis.com/css?family=Hind&display=swap" rel="stylesheet">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" charset="utf-8"></script>
  </head>
  <body>
    <div class="login-form">
      <div class="logo"><img src="images/logo.png" alt=""></div>

      <div class="social-media">
        <button class="fb"><img src="images/fb.png" alt=""></button>
        <button class="google"><img src="images/google.png" alt=""></button>
        <button class="ps"><img src="images/ps.png" alt=""></button>
        <button class="xbox"><img src="images/xbox.png" alt=""></button>
        <button class="switch"><img src="images/switch.png" alt=""></button>
      </div>

      <h6>Sign In</h6>

      <form action="">
        <div class="textbox">
          <input type="text" placeholder="Username Or Email">
          <span class="check-message hidden">Required</span>
        </div>

        <div class="textbox">
          <input type="password" placeholder="Password">
          <span class="check-message hidden">Required</span>
        </div>

        <div class="options">
          <label class="remember-me">
            <span class="checkbox">
              <input type="checkbox">
              <span class="checked"></span>
            </span>
            Remember me
          </label>

          <a href="#">Forgot Your Password</a>
        </div>

        <input type="submit" value="Log In Now" class="login-btn" disabled>
        <div class="privacy-link">
          <a href="#">Privacy Policy</a>
        </div>
      </form>

      <div class="dont-have-account">
        Don't have an Epic Games account?
        <a href="#">Sign Up</a>
      </div>
    </div>

    <script type="text/javascript">
      $(".textbox input").focusout(function(){
        if($(this).val() == ""){
          $(this).siblings().removeClass("hidden");
          $(this).css("background","#554343");
        }else{
          $(this).siblings().addClass("hidden");
          $(this).css("background","#484848");
        }
      });

      $(".textbox input").keyup(function(){
        var inputs = $(".textbox input");
        if(inputs[0].value != "" && inputs[1].value){
          $(".login-btn").attr("disabled",false);
          $(".login-btn").addClass("active");
        }else{
          $(".login-btn").attr("disabled",true);
          $(".login-btn").removeClass("active");
        }
      });
    </script>
  </body>
</html>

css

*{
 margin: 0;
 padding: 0;
 box-sizing: border-box;
 font-family: "hind",sans-serif;
 text-decoration: none;
}

body{
 background: #121212;
 min-height: 100vh;
 display: flex;
 align-items: center;
 justify-content: center;
}

.login-form{
 width: 470px;
 background: #202020;
 padding: 30px 60px;
}

.logo{
 height: 50px;
 text-align: center;
}

.logo img{
 height: 50px;
}

.social-media{
 display: flex;
 margin: 30px 0;
}

.social-media button{
 height: 50px;
 width: 100px;
 margin-right: 10px;
 display: flex;
 align-items: center;
 justify-content: center;
 cursor: pointer;
 border: none;
 transition: .3s linear;
}

.social-media button:last-child{
 margin: 0;
}

.social-media button img{
 width: 20px;
}

.fb{
 background: #4267b2;
}

.google{
 background: #fff;
}

.ps{
 background: #02b3e8;
}

.xbox{
 background: #107c10;
}

.switch{
 background: #e60012;
}

.social-media button:hover {
 opacity: .7;
}

.login-form h6{
 color: #f1f1f1;
 font-size: 15px;
 text-transform: uppercase;
 font-weight: 500;
}

.textbox{
 width: 100%;
 height: 50px;
 position: relative;
 margin-top: 15px;
}

.textbox input{
 width: 100%;
 height: 50px;
 border: none;
 background: #2b2b2b;
 padding: 0 15px;
 font-size: 16px;
 outline: none;
 color: #f4f4f4;
}

.textbox input:focus{
 background: #484848 !important;
}

.check-message{
 position: absolute;
 top: 50%;
 right: 10px;
 color: #fff;
 text-transform: uppercase;
 transform: translateY(-50%);
}

.textbox input:focus + .check-message{
 display: none;
}

.options{
 margin-top: 15px;
 color: #f4f4f480;
 overflow: hidden;
 font-size: 14px;
}

.remember-me{
 float: left;
 display: flex;
 align-items: center;
 cursor: pointer;
}

.checkbox{
 display: inline-block;
 width: 20px;
 height: 20px;
 background: #484848;
 margin-right: 15px;
 position: relative;
}

.checkbox input{
 width: 100%;
 height: 100%;
 opacity: 0;
 cursor: pointer;
}

.checked{
 position: absolute;
 left: 8px;
 top: 4px;
 width: 5px;
 height: 10px;
 border: solid #fff;
 border-width: 0 1px 1px 0;
 transform: rotate(45deg);
 display: none;
}

.checkbox input:checked + .checked{
 display: block;
}

.options a{
 color: #f4f4f480;
 font-size: 14px;
 float: right;
}

.login-btn{
 width: 100%;
 height: 50px;
 margin-top: 30px;
 background: #191919;
 border: none;
 outline: none;
 cursor: pointer;
 text-transform: uppercase;
 font-weight: 700;
 transition: .3s linear;
}

.login-btn.active{
 background: #037bee;
 color: #fff;
}

.login-btn.active:hover{
 opacity: .7;
}

.hidden{
 display: none;
}

.privacy-link{
 text-align: center;
 margin-top: 35px;
}

.privacy-link a{
 color: #f1f1f1;
 font-size: 14px;
}

.dont-have-account{
 font-size: 14px;
 text-align: center;
 color: #f4f4f480;
 margin: 20px 0;
}

.dont-have-account a{
 color: #f1f1f1;
}

@media screen and (max-width:470px) {
 body{
 background: #202020;
 }

 .login-form{
 width: 100%;
 padding: 0 15px;
 }
}

在线演示

让链接同时具备两种打开方式