-1
Good evening. My problem is the following, when screen is very small and is shown the scroll bar the footer does not extend more to 100%.
HTML
<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/style.css">
    <title>JSON2CSV</title>
</head>
<body>
    <div id="container">
        <div id="app">
            <di>
                <h1 id="app-title">JSON to CSV</h1>
            </di>
            <div class="div-input">
                <label for="text-input">JSON</label><br>
                <textarea name="" id="text-input" cols="30" rows="10"></textarea>
            </div>
            <div class="div-actions">
                <div class="div-buttons">
                    <input type="button" value="Convert" class="button" id="button-convert" onclick="onConvert();">
                    <input type="button" value="Clear" class="button" id="button-clean" onclick="onClean();">
                </div>
            </div>
            <div class="div-output">
                <label for="text-output">CSV</label><br>
                <textarea name="" id="text-output" cols="30" rows="10" readonly></textarea>
            </div>
        </div>
        <footer>
            <p class="footer-content">Made with <span id="heart-emoji">❤</span> by <a href="http://" target="_blank" rel="noopener noreferrer" id="link-profile">Thiago</a></p>
        </footer>
    </div>
    <script src="js/app.js"></script>
</body>
</html>
CSS
* {
    margin: 0;
    padding: 0;
    border: 0;
    box-sizing: border-box;
}
body {
    background-color: #03A9F4;
    width: 100%;
}
input[type],
textarea {
    border: 1px solid #03A9F4;
    border-radius: 3px;
}
textarea {
    width: 100%;
    height: 90%;
    overflow: auto;
    resize: none;
}
.div-input,
.div-output {
    width: 40%;
    float: left;
    height: 90%;
}
.div-actions {
    width: 20%;
    float: left;
    padding-top: 30px;
    text-align: center;
    position: relative;
    height: 90%;
}
.div-buttons {
    top: 50%;
    position: absolute;
    transform: translateY(-50%);
}
#app {
    width: 700px;
    height: 400px;
    border: 1px solid red;
    border-radius: 5px;
    padding: 10px;
    background-color: white;
    overflow: hidden;
}
#app-title {
    text-align: center;
    color: #03A9F4;
}
label {
    color: #03A9F4;
}
.button {
    cursor: pointer;
    padding: 5px;
}
.button:hover {
    opacity: 0.8;
}
#button-clean,
#button-convert {
    border: 1px solid #03A9F4;
    width: 100px;
}
#button-convert {
    background-color: #03A9F4;
    color: white;
}
#button-clean {
    background-color: white;
    color: #03A9F4;
    margin-top: 10px;
}
footer {
    background-color: black;
    height: 100px;
    min-width: 100vw;
    position: absolute;
    bottom: 0;
    display: block;
}
.footer-content {
    display: block;
    text-align: center;
    color: grey;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}
#heart-emoji {
    color: red;
}
#link-profile:link {
    text-decoration: none;
}
#link-profile:hover {
    text-decoration: underline;
    color: white;
}
						
