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I have already researched here by SOF but the problems that appeared did not resemble mine, so I would like to know what I did wrong here:

I want to know how to remove this space between the two Ivs leaving them side by side.
The HTML code :
body{
        background-color: #0E6BA8;
    
        
    }
    .container{
        display: grid;
        grid-template-columns: 300px  300px 300px 300px;
        grid-template-rows: 300px  300px 300px 300px;
        display: flex;
        flex-direction: column;
        
    }
    @media(min-width: 680px){
        .container{
            display: flex;
            flex-direction: row;   
        }
    }
    .caixas{
        background-color: #A6E1FA;
        width: 280px;
        height: 280px;
        text-align: center;
        border-radius: 10px;
        border: 3px solid #0A2472;
        margin: 0 auto;
    }
    .input{
        border-radius: 8px;
        padding:5px;
    } 
    <html>
        <head>
            <link rel="stylesheet" href="style.css">
        </head>
    
        <body>
            <div class="container">
            <div class='caixas'>
                <h2>Estrutura sequencial</h2>
                <h3>calculadora de terreno</h3>
                Digite o primeiro valor:
                <br>
                <input type='text' name='valorum' class='input'>
                <br>
                Digite o segundo valor:
                <br>
                <input type='text' name='valordois' class='input'>
                <br>
                Resultado:
                <br>
                <input type='text' name='resultado' class='input'>
            </div>
            <div class='caixas'>
                <h2>Estrutura sequencial</h2>
                <h3>calculadora de terreno</h3>
                Digite o primeiro valor:
                <br>
                <input type='text' name='valorum' class='input'>
                <br>
                Digite o segundo valor:
                <br>
                <input type='text' name='valordois' class='input'>
                <br>
                Resultado:
                <br>
                <input type='text' name='resultado' class='input'>
            </div>
            
            </div>
    
            <script type="text/javascript" src="js.js"></script>
        </body>
    </html>
    
face, heart, THANK YOU <3
– Danilo Costa
@Danilocosta without problems my dear, gives a studied in the adjustment I did, although simple help a lot.
– hugocsl