Edit in JSFiddle

/*myFont: is a mixin, simpar to a function 
which return a set of 
css property configured dynamically*/
/* line 14, ../sass/my-style.scss */
table.ts-student-table .headertext {
  font-weight: bold;
}
/* line 17, ../sass/my-style.scss */
table.ts-student-table thead {
  background: black;
  color: #fff;
}
/* line 24, ../sass/my-style.scss */
table.ts-student-table tbody tr.even {
  font-family: Georgia;
  font-size: 10px;
  color: blue;
  background: #ffcc00;
}
/* line 28, ../sass/my-style.scss */
table.ts-student-table tbody tr.odd {
  font-family: arial;
  font-size: 10px;
  color: red;
  background: gray;
}

<table class='ts-student-table'>
    <thead>
    <tr>
        <th>NAME</th>
        <th>ROLL</th>
        <th>MARK</th>
        <th>COUNTRY</th>
    </tr>
    </thead>
    <tbody>
    <tr class='odd'>
        <td>Sandeep</td>
        <td>001</td>
        <td>235</td>
        <td>India</td>
    </tr>
    <tr class='even'>
        <td>John</td>
        <td>002</td>
        <td>335</td>
        <td>US</td>
    </tr>
    <tr class='odd'>
        <td>Stephen</td>
        <td>003</td>
        <td>135</td>
        <td>UK</td>
    </tr>

    <tr class='even'>
        <td>Philip</td>
        <td>004</td>
        <td>139</td>
        <td>Germany</td>
    </tr>
    <tr class='odd'>
        <td>Sandeep</td>
        <td>001</td>
        <td>235</td>
        <td>India</td>
    </tr>
    <tr class='even'>
        <td>John</td>
        <td>002</td>
        <td>335</td>
        <td>US</td>
    </tr>
    <tr class='odd'>
        <td>Stephen</td>
        <td>003</td>
        <td>135</td>
        <td>UK</td>
    </tr>

    <tr class='even'>
        <td>Philip</td>
        <td>004</td>
        <td>139</td>
        <td>Germany</td>
    </tr>
    <tr class='odd'>
        <td>Sandeep</td>
        <td>001</td>
        <td>235</td>
        <td>India</td>
    </tr>
    <tr class='even'>
        <td>John</td>
        <td>002</td>
        <td>335</td>
        <td>US</td>
    </tr>
    <tr class='odd'>
        <td>Stephen</td>
        <td>003</td>
        <td>135</td>
        <td>UK</td>
    </tr>

    <tr class='even'>
        <td>Philip</td>
        <td>004</td>
        <td>139</td>
        <td>Germany</td>
    </tr>
    </tbody>
</table>