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            myerror("キャプチャの番号が違います。");
            let temp1 = Math.floor(Math.random() * 20);
            let temp2 = Math.floor(Math.random() * 20);
            let dis = temp1 + " + " + temp2;
            dom.innerHTML = dis;
            setBorderRed(num);
        }
        setBorderRed(num);
    }

}

function clearWarningsAndBorders() {
    var myList = document.getElementById("myList");
    myList.innerHTML = "";

    var errorList = document.getElementById("error");
    errorList.innerHTML = "";

    document.getElementById("mylist-title").style.display = "none";
    document.getElementById("error-title").style.display = "none";
    document.getElementById("message").style.display = "none";


    // Reset border colors
    resetBorder(document.getElementById("name"));
    resetBorder(document.getElementById("email"));
    resetBorder(document.getElementById("tel"));
    resetBorder(document.getElementById("content"));
    resetBorder(document.getElementById("num"));
}


function appendWarning(message) {
    document.getElementById("message").style.display = "block";
    document.getElementById("mylist-title").style.display = "block";
    const node = document.createElement("li");
    const textnode = document.createTextNode(message);
    node.appendChild(textnode);
    document.getElementById("myList").appendChild(node);
}

function myerror(message) {
    document.getElementById("message").style.display = "block";
    document.getElementById("error-title").style.display = "block";
    const node = document.createElement("li");
    const textnode = document.createTextNode(message);
    node.appendChild(textnode);
    document.getElementById("error").appendChild(node);
}

function setBorderRed(element) {
    element.style.border = "1px solid red";
}

function resetBorder(element) {
    element.style.border = ""; // Reset to the default border
}