Woocommerce product-details page common customization

woocommerce.php

<?php if (is_single()){ ?>
<style>
/*woocommerce customization*/
  .product_meta {
    float: left;
    clear: both;
    line-height: 50px;
}
button.single_add_to_cart_button.button.alt {
    width: 35%;
    float: left;
}
.quantity {
    width: 38%;
    float: left;
    clear: both;
    display: inline-block;
    line-height: 35px;
} 
.single_add_to_cart_button.button.alt:hover{color: #fff;
    background-color: #000;
  }
.single_add_to_cart_button.button.alt {
   background-color: transparent;
    border: 1px solid #333;
    padding: 12px 20px;
    font-size: 1em;
    display: inline-block;
    padding: 8px 10px;
    margin: 0;
    line-height: 1.42;
    font-weight: normal;
    text-decoration: none;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    border-radius: 2px;
    background-color: #fff;
    color: #333;
    font-family: cursive;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 1.2em;

}
  
  .images{
    float:left;
    width:48%;
  }
  .summary.entry-summary {
    float: right;
    width: 48%;
}
  .woocommerce-tabs.wc-tabs-wrapper {
    clear: both;
}
 li.reviews_tab , li.description_tab , li.additional_information_tab {
    float: left;
    margin-left: 2px;
    margin-right: 2px;
    display: block;
    background: #01b1d7;
    color: black;
/*     padding: 5px 10px 5px 10px; */
}
li.reviews_tab {

   /*float: initial !important; */
}
div#reviews , div#tab-description ,div#tab-additional_information {
  clear: both;
}
 li.reviews_tab.active , li.description_tab.active , li.additional_information_tab.active
{
/* background: #a46497; */
}

li.reviews_tab.active a, li.description_tab.active a , li.additional_information_tab.active a {
    color: #ccc;
    text-decoration: none;
}
 li.reviews_tab a, li.description_tab a, li.additional_information_tab a
{
color: black ;
}
li.reviews_tab:hover, li.description_tab:hover, li.additional_information_tab:hover
{
color: red ;
}
div.ecwid-productBrowser-relatedProducts .ecwid-productBrowser-price {
display: none;
}
  </style>
<?php }?>

//pricefilter for variable product
function wc_ninja_custom_variable_price( $price, $product ) {
// Main Price
$prices = array( $product->get_variation_price( 'min', true ), $product->get_variation_price( 'max', true ) );
$price = $prices[0] !== $prices[1] ? sprintf( __( 'From: %1$s', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

// Sale Price
$prices = array( $product->get_variation_regular_price( 'min', true ), $product->get_variation_regular_price( 'max', true ) );
sort( $prices );
$saleprice = $prices[0] !== $prices[1] ? sprintf( __( 'From: %1$s', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

if ( $price !== $saleprice ) {
    $price = '' . $saleprice . ' ' . $price . '';
}

return $price;

}
add_filter( 'woocommerce_variable_sale_price_html', 'wc_ninja_custom_variable_price', 10, 2 );
add_filter( 'woocommerce_variable_price_html', 'wc_ninja_custom_variable_price', 10, 2 );

For tab add nav nav-tabs this class beside the tabs wc-tabs in Root dir>woocommerce>single-product>tabs>tabs.php on line no.34