<div class="tool-wrapper">
 <!-- Nav tabs -->
 <div class="tabs-wrapper">
 <ul class="nav nav-justified classic-tabs tabs-blue" role="tablist">
 <li class="nav-item">
 <a class="nav-link waves-light active" data-toggle="tab" href="#tab-google" role="tab"><i class="fa fa-google fa-2x" aria-hidden="true"></i><br> Google</a>
 </li>
 </ul>
 </div>

<!--Google-->
 <div class="tab-content card">

<!--Panel 1-->
 <div class="tab-pane fade in show active" id="tab-google" role="tabpanel">
 <a href="#" class="btn-sm btn-floating btn-blue-grey tab-info-button" data-toggle="modal" data-target="#google-information-modal"><i class="fa fa-info mr-1"></i></a>
 <form data-suggest-form="true" data-suggest-network="google">
 <div class="md-form">
 <input type="text" name="query" id="form1" class="form-control">
 <label for="form1" class=""><?php _e('Your keyword', 'hypertheme');?></label>
 </div>
 <div class="row">
 <div class="col-md-6">
 <div class="md-form">
 <select name="country" id="country" class="mdb-select" searchable="<?php _e('Search here..', 'hypertheme');?>">
 <option value="" disabled selected><?php _e('Choose your country', 'hypertheme');?></option>
 <?php
 foreach ($countries as $code => $country) {
 ?>
 <option value="<?php echo strtolower($code); ?>"><?php echo $country; ?></option>
 <?php } ?>
 </select>
 <label for="country"><?php _e('Country', 'hypertheme');?></label>
 </div>

</div>
 <div class="col-md-6">
 <div class="md-form">
 <select name="language" class="mdb-select" searchable="<?php _e('Search here..', 'hypertheme');?>">
 <option value="" disabled selected><?php _e('Choose your language', 'hypertheme');?></option>
 <?php
 foreach ($languages as $code => $language) {
 ?>
 <option value="<?php echo strtolower($code); ?>" data-country="<?php echo $language['country']; ?>"><?php echo $language['name']; ?></option>
 <?php } ?>
 </select>
 <label><?php _e('Language', 'hypertheme');?></label>
 </div>
 </div>
 </div>
 <div class="text-center">
 <button type="submit" class="btn btn-primary center-block"><i class="fa fa-search"></i> <?php _e('Search', 'hypertheme');?></button>
 </div>
 </form>
 </div>
 <!--/.Google-->

Hi, Sekra24

.tab-content.card makes top left and top right corner rounded, so you have this 'problem'. You can add next lines to your css, and that will be ok:

.tab-content {
 border-top-left-radius: 0;
 border-top-right-radius: 0;
}

and to prevent jumping content when clicking on tabs, you can add next css:

.classic-tabs li a {
 border-bottom: 3px solid transparent;
 }

Greetings
Josip