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Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

All hex value from 100% to 0% alpha:

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$.ajax({
    url: "https://reqres.in/api/users",
    type: "POST",
    data: {
        name: "paul rudd",
        movies: ["I Love You Man", "Role Models"]
    },
    success: function(response){
        console.log(response);
    }

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var xhr = new XMLHttpRequest();
xhr.open("GET", "https://reqres.in/api/products/3", true);
xhr.onload = function(){
    console.log(xhr.responseText);
};
xhr.send();

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{
    "name":"paul rudd",
    "movies[]":[
        "I Love You Man",
        "Role Models"
    ],
    "id":"243",
    "createdAt":"2014-10-18T12:09:05.255Z"
}

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{
    "data":{
        "id":3,
        "name":"true red",
        "year":2002,
        "pantone_value":"19-1664"
    }
}

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<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    <sitemap>
        <loc>https://stackoverflow.com/sitemap-questions-0.xml</loc>
    </sitemap>
    <sitemap>
        <loc>https://stackoverflow.com/sitemap-questions-1.xml</loc>
    </sitemap>
    <sitemap>
        <loc>https://stackoverflow.com/sitemap-questions-2.xml</loc>

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function copyStringToClipboard (str) {
   // Create new element
   var el = document.createElement('textarea');
   // Set value (string to be copied)
   el.value = str;
   // Set non-editable to avoid focus and move outside of view
   el.setAttribute('readonly', '');
   el.style = {position: 'absolute', left: '-9999px'};
   document.body.appendChild(el);
   // Select text inside element

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[Unit]
Description=Keeps a tunnel to 'remote.example.com' open
After=network.target

[Service]
User=autossh
# -p [PORT]
# -l [user]
# -M 0 --> no monitoring
# -N Just open the connection and do nothing (not interactive)

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Create container

1. docker run -dt --network host --name mycontainer ubuntu:18.04
2. docker exec -it mycontainer /bin/bash

Mount volumes

3. docker run -dt --network host --name mycontainer -v "$PWD":/home mycontainer-2

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sudo apt-get update
sudo apt-get install apache2
sudo ufw allow in "Apache Full"
sudo apt-get install curl

sudo apt-get install mysql-server
mysql_secure_installation

sudo apt-get install php libapache2-mod-php php-mcrypt php-mysql
sudo systemctl restart apache2