I have added the white color linear gradient with less opacity for the border but it is showing the black border.
.input-field {
width: 300px;
height: 50px;
padding: 18px 28px;
border-radius: 18px;
background: linear-gradient(126.6deg, rgba(255, 255, 255, 0.12) 28.69%, rgba(255, 255, 255, 0) 100%);
backdrop-filter: blur(140px);
border-radius: 20px;
border: 2px solid;
border-image-source: linear-gradient(123.98deg, rgba(255, 255, 255, 0.5) 0%, rgba(255, 255, 255, 0) 127.65%),linear-gradient(268.18deg, rgba(255, 255, 255, 0.6) -17.36%, rgba(239, 239, 239, 0) 15.78%);
}
<input type="email" class="input-field" placeholder="Name">