html - How do i style PHP validations -

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this first time using php validation , validations working perfectly. how style validation, select echo function or have change validation code able style it. have tried using span , echoing out error function , changing echo's error function e.g $emailerr not luck, validations not work. suggestions?

html 

            <!--                    <div id="first">-->             <input type="email" id="email" name="email" placeholder="email address" value='' required><!--<span class="error"><!--<?php //echo $c_emailerr;            ?></span>-->             <br>              <figure>                 <input class ="login-field" type="password" id="pass1" name="pass1" value="" placeholder="password"  maxlength="30" required><!--<span class="error"><1--<?php //echo $c_pass1err;            ?></span>-->                 <input class ="login-field" type="password" id="pass2" name="pass2" value="" placeholder=" confirm password" maxlength="30" required><!--<span class="error"><!--<?php //echo $c_pass2err;            ?></span>-->                 <div id="messages"></div>             </figure>             <p class="remember_me">             </p>             <input type="submit" name="submit" value="register" id="submit_button" class="btn btn-default">             <br>         </form>

php

  <?php         if (isset($_post['submit'])) {             $reg_errors = array();             $c_email = $_post['email'];             $c_pass1 = $_post['pass1'];             $c_pass2 = $_post['pass2'];             $emailerr = $pass1err = $pass2err = "";            // $c_email = $c_pass1 = $c_pass2 = "";            // remove illegal characters email            // $c_email = filter_var($c_email, filter_sanitize_email);            //checking email address             if (!filter_var($c_email, filter_validate_email) === false) {             echo("<b> valid email address </b>");             } else {                 echo("<b> email not valid email address</b>");             }             if (strlen($c_pass1) <= '8') {              echo "<b>your password must contain @ least 8 characters!</br>";              //check passwords             }elseif ($c_pass1 == $c_pass2) {             $q = "insert      cus_register(cus_email,cus_password,cus_confirm_password) values (?,?,?)";                 $stmt = mysqli_prepare($dbc, $q);                 //new                 // $stmt = mysqli_prepare($dbc, $insert_c);                 //debugging                 //$stmt = mysqli_prepare($dbc, $insert_c)  or die(mysqli_error($dbc));                mysqli_stmt_bind_param($stmt, 'sss', $c_email, $c_pass1, $c_pass2);                 if ($q) {                     echo "<script> alert('registration sucessful')</script>";                 }             } else {                 echo "<b>oops! passwords not </b>";             }         }          ?>

say had tag text , have code 

<?  echo '<t>this text';  ?>

to add styles have style "t" tag in css

t{    font-size:3px;    background-color:red;    // other styles    }


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