JSFiddle - React, Tailwind, and code Playground

by Alex Slepenkov

HTML

<div id="cbf" class="callback-modal">
            <form action="action_page.php" method="post">
                <a href="#" class="closebtn">Г—</a>
                <fieldset>
                    <legend align="center">Обратный звонок</legend>
                    <input type="tel" name="usrtel" placeholder="Ваш телефон" required>
                </fieldset>
                <input type="submit" value="Отправить">
            </form>
        </div>

CSS

.callback-modal {
    display: none;
}
 
 .callback-modal {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        overflow: auto;
        background-color: rgb(0, 0, 0);
        background-color: rgba(0, 0, 0, 0.4);
        z-index: 9999;
    }
 
.callback-modal form {
        position: relative;
        margin: 0 auto;
    }
 
    .callback-modal:target {
        display: block;
    }
 
    .closebtn {
        text-decoration: none;
        position: absolute;
        top: 0;
        right: 20px;
        font-size: 32px;
        font-weight: bold;
        color: #838383;
    }
 
    .closebtn:hover,
    .closebtn:focus {
        color: #7a0000;
        text-decoration: none;
        cursor: pointer;
    }