rm .txt_field{
            position: relative;
            border-bottom: 2px solid #adadad;
            margin: 30px 0;
        }
        .txt_field input{
            width: 100%;
            padding: 0 5px;
            height: 40px;
            font-size: 16px;
            border: none;
            background: none;
            outline: none;
        }
        .txt_field label{
            position: absolute;
            top: 50%;
            left: 5px;
            color: #adadad;
            transform: 