<form method="post">
<h3 class="bg-primary text-center pad-basic no-btm">Agregar Registro</h3>
<table class="table bg-info" id="tabla">
<tr class="fila-fija">
<td><input required name="nombre[]" placeholder="ID Alumno"/></td><br>
<td><input required name="apellido[]" placeholder="Nombre Alumno"/></td><br>
<td><input required name="email[]" placeholder="Carrera"/></td>
<td><input required name="telefono[]" placeholder="Grupo"/></td>
<td class="eliminar"><input type="button" value="Menos -"/></td>
</tr>
</table>
<div class="btn-der">
<input type="submit" name="insertar" value="Agregar" class="btn btn-info"/>
<button id="adicional" name="adicional" type="button" class="btn btn-warning"> Más + </button>
</div>
</form>