Text won't absolutely position using CSS? - html

Question

I am new to CSS and HTML, and I am working on my final project for school.
I am trying to absolutely position some text "Welcome" to a div I've made. For some reason it won't position in relation to the div, I've looked it over 10 times and can't figure out why.
I want the "Welcome" text to sit at the bottom of the welcome div, however when I put bottom:0px; into the CSS, it doesn't position according to its parent container and instead goes 0px from the top of the whole screen.
Here's the code:
#wrapper {
height: 1000px;
margin: 0 auto;
background-image: url(images/background.jpg);
background-size: 100% 100%;
}
#header {
height: 150px;
position: relative;
background-color: red;
}
#welcome {
position: absolute;
bottom: 0;
width: 420px;
height: 100px;
background-color: green;
}
.w {
height: 150px;
position: absolute;
font-size: 64px;
left: 20px;
bottom: 0px;
color: #fff;
}
<div id="wrapper">
<header id="header">
<div id="welcome">
<p class="w">Welcome</p>
</div>
<nav id="main nav"></nav>
</header>
</div>

Answer 1

You are very close. Take the height away from the .w p tag and remove its margin as well:
#wrapper {
height: 1000px;
margin: 0 auto;
background-image: url(images/background.jpg);
background-size: 100% 100%;
}
#header {
height: 150px;
position: relative;
background-color: red;
}
#welcome {
position: absolute;
bottom: 0;
width: 420px;
height: 100px;
background-color: green;
}
.w {
/*height: 150px;*/
margin: 0;
position: absolute;
font-size: 64px;
left: 20px;
bottom: 0px;
color: #fff;
}
<div id="wrapper">
<header id="header">
<div id="welcome">
<p class="w">Welcome</p>
</div>
<nav id="main nav"></nav>
</header>
</div>

Answer 2

The problem, as CalvinNunes pointed out, is that you have a height set on .w div. And, p elements have margin and line-height values by default. You need to remove the margin and set the line-height to 1 or less (.5 makes the text touch the bottom of the green box).
#wrapper {
height: 1000px;
margin: 0 auto;
background-image: url(images/background.jpg);
background-size: 100% 100%;
position: relative;
}
#header {
height: 150px;
background-color: red;
position: absolute;
width: 100%;
}
#welcome {
position: absolute;
bottom: 0;
width: 420px;
height: 100px;
background-color: green;
}
.w {
position: absolute;
font-size: 64px;
left: 20px;
bottom: 0px;
color: #fff;
margin: 0;
line-height: 1;
}
<div id="wrapper">
<header id="header">
<div id="welcome">
<p class="w">Welcome</p>
</div>
<nav id="main nav">
</nav>
</header>
</div>
<!-- End of wrapper-->

Answer 3

If you use absolute on something, related dom element should be relative, absolute or fixed, depending on your needs.
Also check if your absolute element doesn't have some unneeded margins etc.
But in your usage case i don't think that there is absolute needed. you can use bigger paddings for parent element top. Also this can be achieved using flex-end, which will allow dynamic text input.