php코드 안에서 테이블 스타일 주는 방법

<?php
?> 
$username = "rlwnd70";
$password = "wnd03500";
$dbname = "rlwnd70";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
     die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT wr_1, wr_name, wr_2,wr_3,wr_4 FROM g5_write_store";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
     echo "<table="여기다 클라스주고싶은데요"><tr><th>상호</th><th>이름</th><th>주소</th><th>전화번호</th><th>작업가능 층수</th></tr>";
     // output data of each row
     while($row = $result->fetch_assoc()) {
         echo "<tr><td>" . $row["wr_1"]. "</td><td>" . $row["wr_name"]. "</td><td> " . $row["wr_2"]. "</td><td>" . $row["wr_3"]."</td><td>" . $row["wr_4"]."</td></tr>";
     }
     echo "</table>";
} else {
     echo "0 results";
}

$conn->close();
?>  ​

echo "<table class="no_left_border"> 저 안에서 클라스 지정하니까 아무것도 안뜨는데 해결방법없나요?