تا حدودی بهتر شد:
SharedScreenshot26.jpg
<!DOCTYPE html>
<html lang="fa">
<head>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
    <meta charset="utf-8" />
    <title></title>
    <style media="screen">
      *,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    
}
body
{
    background: linear-gradient(to bottom, #323232 0%, #3F3F3F 40%, #1C1C1C 150%), linear-gradient(to top, rgba(255,255,255,0.40) 0%, rgba(0,0,0,0.25) 200%);
 background-blend-mode: multiply;
  /*  background-color: #FFDEE9;
background-image: linear-gradient(0deg, #FFDEE9 0%, #B5FFFC 100%);
    background-color: #A9C9FF;
background-image: linear-gradient(180deg, #A9C9FF 0%, #FFBBEC 100%);
    background-color: #0093E9;
background-image: linear-gradient(160deg, #0093E9 0%, #80D0C7 100%);
/*
    background-color: #4158D0;
background-image: linear-gradient(43deg, #4158D0 0%, #C850C0 46%, #FFCC70 100%); */
}
   /*  background-color: #080710;
    height: 100% !important;
    background-image: linear-gradient(60deg, #abecd6 0%, #fbed96 100%); 
}
.background{
    width: 100%;
    height: 100%;
    position: absolute;
    transform: translate(-50%,-50%);
    left: 50%;
    top: 50%;
}
.background .shape{
    height: 100%;
    width: 100%;
    position: absolute;
    border-radius: 50%;
    
}
.shape:first-child{
    background: linear-gradient(
        #1845ad,
        #23a2f6
    );
    left: -80px;
    top: -80px;
}
.shape:last-child{
    background: linear-gradient(
        to right,
        #ff512f,
        #f09819
    );
    right: -30px;
    bottom: -80px;
} */
form{
    height: 520px;
    width: 400px;
    background-color: rgba(255,255,255,0.13);
    position: absolute;
    /* transform: translate(-100%,-50); */
    top: 50px;
    /* left: 50%; */
    
    border-radius: 10px;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255,255,255,0.1);
    box-shadow: 0 0 40px rgba(8,7,16,0.6);
    padding: 50px 35px;
}
form *{
    font-family: 'Poppins',sans-serif;
    color: #ffffff;
    letter-spacing: 0.5px;
    outline: none;
    border: none;
}
form h3{
    font-size: 32px;
    font-weight: 500;
    line-height: 42px;
    text-align: center;
}
label{
    display: block;
    margin-top: 30px;
    font-size: 16px;
    font-weight: 500;
}
input{
    display: block;
    height: 50px;
    width: 100%;
    background-color: rgba(255,255,255,0.07);
    border-radius: 3px;
    padding: 0 10px;
    margin-top: 8px;
    font-size: 14px;
    font-weight: 300;
}
::placeholder{
    color: #e5e5e5;
}
button{
    margin-top: 50px;
    width: 100%;
    background-color: #ffffff;
    color: #080710;
    padding: 15px 0;
    font-size: 18px;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
}
.social{
  margin-top: 30px;
  display: flex;
}
.social div{
  background: red;
  width: 150px;
  border-radius: 3px;
  padding: 5px 10px 10px 5px;
  background-color: rgba(255,255,255,0.27);
  color: #eaf0fb;
  text-align: center;
}
.social div:hover{
  background-color: rgba(255,255,255,0.47);
}
.social .fb{
  margin-right: 25px;
}
.social i{
  margin-left: 4px;
}
    </style>
</head>
<body dir="rtl">
<!--<div class="background">
        <div class="shape"></div>
        <div class="shape"></div>
    </div>-->
   
    <table style="width: 100%; height: 100%">
    <col  width="50%;"/><col width="50%;"/>
    <tr>
    <td>
    
    </td>
    <td align="center" valign="middle">
    <form >
        <h3>ورود به گنجه کلید</h3>
        <label for="username">نام کاربری</label>
        <input type="text" placeholder="Email or Phone" id="username">
        <label for="password">رمز ورود</label>
        <input type="password" placeholder="Password" id="password">
        <button>ورود</button>
        <div class="social">
          <div class="go"><i class=""></i>بازیابی رمز!</div>
          <div class="fb"><i class="fab"></i>ایجاد حساب جدید</div>
        </div>
    </form>
    </td>
    </tr>
    </table>
    
   
</body>
</html>