Why Does Container Div Insist on Being Slightly Larger Than Img or Svg Content

Why does container div insist on being slightly larger than IMG or SVG content?

Trying adding:

img { display: block; }

to your CSS. Since an <img> is an inline element by default, its height is calculated differently as related to the default line-height value.

On inline elements, the line-height CSS property specifies the height that is used in the calculation of the line box height.

On block level elements, line-height specifies the minimal height of line boxes within the element.

Source: https://developer.mozilla.org/en/CSS/line-height

div container larger than image inside

now used to this

img, #banner-img{
vertical-align: top;
}

Why does my Gatsby/Material-UI site render slightly larger than the viewport?

Solved. Adding a root div element with padding at least half of spacing pixels, so for spacing={8}, the root div should have padding={32}.

This is well-known functionality of Material-UI Grid.

Related to this issue.

Element aligned below bottom = 0px

As you can see by this example, the div.card is a little taller than 150px (the height of the image).

If you explicitly set the height of the <div> to the height of the image like in this example, this will be solved.

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Actually, an easier way (as suggested by this SO answer), says that this is because the <img> is, by default, an inline-block element and this causes the height of the container <div> to be calculated a little differently.

Adding a simple img { display: block; } will be an easier way to solve this, as shown in this example.

Series of divs, where on each one is stacked a black div with transparency, with a centered text

When one mix elements (siblings) where some have a position other than static, they end up in a higher layer, hence, in your case, the h1 sits behind.

As mentioned, for z-index to work it need a position (other than static), though one rarely need to use z-index, instead make sure all, or none, has a position, so in your case, simply drop z-index and add position: relative

.square-container {  min-height: auto;  background-color: white;}
.square {  width: 100vmin;  height: 100vmin;  color: white;}
.hover-square {  background: black;  width: 100vmin;  height: 100vmin;  margin-top: 0;  margin-bottom: 4px;  position: absolute;  opacity: 0.5;}
.square-logo {  width: 12.5%;  height: auto;  margin-left: 50%;  transform: translateX(-50%);}
h1 {  position: relative;  height: 87.5vmin;  width: 100%;  font-size: 36px;  text-align: center;  vertical-align: middle;  line-height: 100vmin;  margin: 4px auto;}
.square h1.first {  margin-top: 50px;  margin-bottom: 4px;}

<div class="square-container">  <div class="square" style="background-color: #e74c3c">    <div class="hover-square"></div>    <h1 class="first">Case 1</h1>    <img class="square-logo" src="//pmcdeadline2.files.wordpress.com/2016/07/logo-tv-logo.png">  </div></div>

Transitioning anchor side

So it's definitely possible, but instead of trying to achieve it with a combination of top and bottom, you can achieve it with using top and translate. This will allow you to have a clear point for your stop and start whilst still giving you the freedom of a responsive container.

It would look something like this:

from {
    top: 4px;
    transform: translateY(0);
}

to {
    top: calc(100% - 4px);
    transform: translateY(-100%);
}

Here's an example in action, (I've used a textarea so that you can resize and keep testing, the button(+js) is just there to help facilitate the class change)

$('.go').click(function(){    $('textarea').toggleClass('up');});

textarea {  position: fixed;  top: 0;  -webkit-transform: translateY(0);  transform: translateY(0);  -webkit-transition: all 1s ease 0s;  transition: all 1s ease 0s;  left: 150px;}
textarea.up {  top: 100%;  -webkit-transform: translateY(-100%);  transform: translateY(-100%);}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><button class="go">TRANSITION</button><textarea></textarea>

Lightbox position

You can't center it with the width and height being percentages (at least not without using JS).

You can however set a static height and width and center it like this:

Use top: 50%; left: 50%; and static, negative top and left margins, which should be half of the width/height of your element.

.white_content {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    margin: -182px 0 0 -182px;
    width: 300px;
    height: 300px;
    padding: 16px;
    border: 16px solid green;
    background-color: white;
    z-index: 1002;
    overflow: auto;
}

JSFiddle

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