html код для сайта - Вопросы по CSS

 <!-- ------- установим стили блока DIV -------- -->
<style>
#line_block { 
        width:400px; 
        height:500px; 
        background:transparent; 
        float:left; 
        margin: 0 15px 15px 0; 
        text-align:center;
        padding: 100px;
        }
</style>
   <!-- ---------- вставим блоки на страницу --------- -->
<div style="width:100%; height:1px; clear:both;"></div> <!-- выравниваем без обтекания -->

<div id="line_block"><div style="height:500px; width:400px; border:1px solid #696868; float:left; overflow:auto; margin:10px;">
<img src="https://сайт.ру/images/Suzuki_Cat/1-1-Engine-Gasket.jpg" alt="текст" width="600" height="780" usemap="imgmap2017121313753" /></div>
<p><map name="imgmap2017121313753" id="imgmap2017121313753">
<area alt="Комплект " coords="240,45,261,69" shape="rect" href="https://сайт.ру/index.php/magazin/product/view/89/566"" target="" title="" />
<area alt="" coords="163,443,195,478" shape="rect" target="" title="" />
<area alt="" coords="162,321,189,351" shape="rect" target="" title="" />
<area alt="" coords="465,153,490,190" shape="rect" target="" title="" />
<area alt="" coords="288,136,305,162" shape="rect" target="" title="" />
<area alt="" coords="479,312,499,335" shape="rect" target="" title="" />
<area alt="" coords="4,154,32,178" shape="rect" target="" title="" />
<area alt="" coords="379,644,411,666" shape="rect" target="" title="" />
<area alt="" coords="96,306,122,330" shape="rect" target="" title="" />
<area alt="" coords="97,252,135,277" shape="rect" target="" title="" />
</map></p></div> 
<div id="line_block"><div style="height:500px; width:400px; border:1px solid #696868; float:left; overflow:auto; margin:10px;">
<img src="https://сайт.ру/images/Suzuki_Cat/1-1-Engine-Gasket.jpg" alt="текст" width="600" height="780" usemap="imgmap2017121313753" /></div>
<p><map name="imgmap2017121313753" id="imgmap2017121313753">
<area alt="Комплект " coords="240,45,261,69" shape="rect" href="https://сайт.ру/index.php/magazin/product/view/89/566"" target="" title="" />
<area alt="" coords="163,443,195,478" shape="rect" target="" title="" />
<area alt="" coords="162,321,189,351" shape="rect" target="" title="" />
<area alt="" coords="465,153,490,190" shape="rect" target="" title="" />
<area alt="" coords="288,136,305,162" shape="rect" target="" title="" />
<area alt="" coords="479,312,499,335" shape="rect" target="" title="" />
<area alt="" coords="4,154,32,178" shape="rect" target="" title="" />
<area alt="" coords="379,644,411,666" shape="rect" target="" title="" />
<area alt="" coords="96,306,122,330" shape="rect" target="" title="" />
<area alt="" coords="97,252,135,277" shape="rect" target="" title="" />
</map></p></div> 
<div id="line_block">DIV 3</div>
<div id="line_block">DIV 4</div>
<div id="line_block">DIV 5</div>
<div id="line_block">DIV 6</div>