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how to align divs when multiple divs are disturbing its alignment

I have been trying to line up several divs in a row. I have 8 divs next to each other, but when I try to allign the 2nd row, I can only fit one div in. I need help

Here is my code:

<!DOCTYPE html>
    <html lang="en">
    <body bgcolor="H70D4R334">
    <title>Ordinate</title>
    <head>
        <style text/css> 

    #div1{
        float:left;
        width:50px;
        height:50px;
        margin-top:50px;
        margin-right:500px;
        margin-left:400px;
        border:0px solid blue;
    }
    #div2{
        float:left;
        width:50px;
        height:50px;
        margin-top:50px;
        margin-right:50px;
        border:0px solid blue;
    }
    #div3{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-right:5px;
        border:0px solid green;
    }
    #div4{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-left:5px;
        border:0px solid green;
    }
    #div5{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-left:5px;
        border:0px solid green;
    }
    #div6{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-left:5px;
        border:0px solid green;
    }
    #div7{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-left:5px;
        border:0px solid green;
    }
    #div8{
        float:left;
        width:50px;
        height:50px;
        margin-top:300px;
        margin-left:5px;
        border:0px solid green;
    }
    #div10{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:400px;
        border:1px solid green;
    }
    #div11{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #div12{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #div13{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;        
    }
    #div14{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #div15{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #div16{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #div17{
        float:left;
        width:50px;
        height:50px;
        margin-top:100px;
        margin-left:5px;
        border:1px solid green;
    }
    #Button{
        float:center;
        width:200px;
        height:50px;
        margin:25px;
    }

    </style>



    <script>
    var dragSrcEl = null;
    var draggSrcID = null;

        function dragStart(ev) {
        draggSrcID = ev.target.id;
        dragSrcEl = ev.target;
        ev.dataTransfer.effectAllowed = 'move';
        ev.dataTransfer.setData('text/html', ev.target.outerHTML);
        }

        function allowDrop(ev) {
            ev.preventDefault();
        }

        function drop(ev) {
            ev.target.appendChild(document.getElementById(draggSrcID));
            ev.preventDefault();
        } 

        function swapDrop(ev) {

          if (ev.stopPropagation) {
            ev.stopPropagation(); // Stops some browsers from redirecting.
          }

          // Don't do anything if dropping the same image we're dragging.
          if (dragSrcEl != ev.target) {
            // Set the source image to the HTML of the image we're dropping on.
            srcEl = document.getElementById(draggSrcID);
            srcEl.outerHTML = ev.target.outerHTML;
            ev.target.outerHTML = ev.dataTransfer.getData('text/html');
           }
            ev.preventDefault();
        }       

    </script>   
    </head>
    <body>
    <center><font size="10">Ordinate</font></center>
        <div id="div10" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div11" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div12" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div13" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div14" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div15" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div16" ondrop="drop(event)" ondragover="allowDrop(event)"> 
        </div>
        <div id="div17" ondrop="drop(event)" ondragover="allowDrop(event)">
        </div> 
        <div id="div1" ondrop="swapDrop(event)" ondragover="allowDrop(event)">
        <img id="D" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=D&w=50&h=50" draggable="true" ondragstart="dragStart(event)" />
        </div>
        <div id="div2" ondrop="swapDrop(event)" ondragover="allowDrop(event)">
        <img id="E" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=E&w=50&h=50" draggable="true" ondragstart="dragStart(event)">
        </div>
        <div id="div3" ondrop="swapDrop(event)" ondragover="allowDrop(event)">
        <img id="I" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=I&w=50&h=50" draggable="true" ondragstart="dragStart(event)">  
        </div>
        <div id="div4" ondrop="swapDrop(event)" ondragover="allowDrop(event)"> 
        <img id="T" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=T&w=50&h=50" draggable="true" ondragstart="dragStart(event)">
        </div>
        <div id="div5" ondrop="swapDrop(event)" ondragover="allowDrop(event)"> 
        <img id="A" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=A&w=50&h=50" draggable="true" ondragstart="dragStart(event)">
        </div>
        <div id="div6" ondrop="swapDrop(event)" ondragover="allowDrop(event)"> 
        <img id="N" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=N&w=50&h=50" draggable="true" ondragstart="dragStart(event)">  
        </div>
        <div id="div7" ondrop="swapDrop(event)" ondragover="allowDrop(event)"> 
        <img id="O" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=O&w=50&h=50" draggable="true" ondragstart="dragStart(event)">
        </div>
        <div id="div8" ondrop="swapDrop(event)" ondragover="allowDrop(event)"> 
        <img id="R" src="https://placeholdit.imgix.net/~text?txtsize=20&txt=R&w=50&h=50" draggable="true" ondragstart="dragStart(event)">  
        </div>
        <center><input id="Button" type="submit" value="Click me to check" onclick="HitEnter()"></center>
        <script>
            word = "ordinate"
            function HitEnter() {
                for (i = 10, str = ""; i <= 17; i++) {
                    if (document.getElementById("div" + i).childNodes.length > 1) {
                        str += document.getElementById("div" + i).childNodes[1].id
                    }
                }
                if (str.toLowerCase() == word) {
                    alert("Good job!!!")
                }
                else {
                alert('You got the word incorrect! Please try again.')

                }
            }
        </script>
    </body>
    </html>

I am a beginner at css, js, and html. I will appreciate any help I can get. Thank You!

You have set following attributes for you div with the id 1

margin-right: 500px;
margin-left: 400px;

therefore it's positioned 400 px away from left border. Since you also have margin right set, the next element to it's right is set 500px away. This is why your rows break.

Edit:

how to fix it: Remove all

margin-right 

from your second row and add

margin-left: 5px 

to have it the same as the other row

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