css div gradient shadow/border - html

Question

I am trying to achieve this:
I couldn't find anything like it, but here is my failed attempt:
#one {
width: 200px;
height: 100px;
background-color: white;
box-shadow: 0px 0px 20px #2D8DBD;
left: 50px;
display: inline-block;
margin-right: -100px;
}
#two {
width: 200px;
height: 100px;
background-color: white;
box-shadow: 0px 0px 20px #B22D2D;
left: -50px;
display: inline-block;
margin-left: -50px;
z-index: -1;
}
<center>
</br>
</br>
<div id="one"></div>
<div id="two"></div>
</center>
jsFiddle demo.
I am using bootstrap, so I don't think just making another "gradient" image would be simpler.
Also, I have tried compromising for this: http://designposts.net/fresh-free-css3-and-html5-tutorials/ but my image is circled, and so it turns out as a cut square.

Answer 1

You can fake one, using background gradient and a box-shadow, as well as a css pseudo element to mask the border. Note that if you change the background color of the surrounding content you have to change every instance of #444
.outer {
box-sizing: border-box;
padding: 25px;
height: 200px;
width: 200px;
box-shadow: 0px 0px 10px 10px #444 inset;
border-radius: 50%;
background: linear-gradient(to bottom right, rgb(250,50,50), rgb(50,150,250));
}
.outer::before {
content: "";
display: block;
position: relative;
left: -26px;
top: -26px;
height: 202px;
width: 202px;
border-radius: 50%;
border: 3px solid #444;
box-sizing: border-box;
}
.inner {
position:relative;
top: -204px;
left: -3px;
border-radius: 50%;
background: linear-gradient(to bottom right, #ee2135, #6279ff);
padding: 2px;
height: 150px;
width: 150px;
box-shadow: 0px 0px 30px -5px black;
}
.content {
height: 100%;
width: 100%;
background: #444;
border-radius: 50%;
}
/* Styling only past here */
html, body {
text-align: center;
padding: 0px;
margin: 0px;
height: 100%;
background: #444;
}
body::before {
content: "";
display: inline-block;
vertical-align: middle;
height: 100%;
}
.outer {
display: inline-block;
vertical-align: middle;
}
<div class="outer">
<div class="inner">
<div class="content">
</div>
</div>
</div>

Answer 2

As I understand your request, you need a border on the element that is filled with a gradient effect.
That could be get with a border-image, but then the border-radius wouldn't work.
If your inner background is black solid, that can be achieved setting different backgrounds, and playing with the zone affected by each one (with background-clip and background-origin)
In the snippet, 2 examples, one with radial gradients and the other with linear gradients
The best about that solution is that the border is still a border. You can set the width, the radius, and so on, the usual way
.test {
width: 250px;
height: 200px;
display: inline-block;
margin: 5px;
border-radius: 20px;
border: solid 10px transparent;
}
#test1 {
background: linear-gradient(black, black),
radial-gradient(circle at left top, red 30px, transparent 150px),
radial-gradient(circle at right top, blue 30px, transparent 150px),
cyan;
background-clip: content-box, border-box, border-box, border-box;
background-origin: content-box, border-box, border-box, border-box;
}
#test2 {
background: linear-gradient(black, black),
linear-gradient(to bottom right, red 30px, transparent 150px),
linear-gradient(to bottom left, blue 30px, transparent 150px),
cyan;
background-clip: content-box, border-box, border-box, border-box;
background-origin: content-box, border-box, border-box, border-box;
}
<div class="test" id="test1"></div>
<div class="test" id="test2"></div>

Answer 3

You may be able to do this with a single element, in conjunction to a pseudo element to act as the border. This may have a higher browser compatibility than border-image.
mock up demo
html,
body {
margin: 0;
padding: 0;
}
html {
background: #222;
}
div {
height: 200px;
width: 200px;
background: gray;
position: relative;
border-radius: 10px;
margin: 20px auto;
}
div:before {
content: "";
position: absolute;
top: -5%;
left: -5%;
border-radius: inherit;
height: 110%;
width: 110%;
z-index: -1;
background: linear-gradient(to bottom right, rgba(250, 50, 50, 0.5), rgba(50, 150, 250, 0.5)), linear-gradient(to bottom left, blue 30px, transparent 150px);
box-shadow: inset 0 0 10px 5px #222;
}
<div></div>

Answer 4

This is done with just CSS Grid, no JavaScript. Check it out and see if this is what you are looking for
https://codepen.io/dszlauer/pen/RLjwZq?editors=1100#
<html>
<body>
<div class="grid">
<div class="blurBox"></div>
<div class="inputBox">
<div class="fName">f</div>
<div class="lName">l</div>
</div>
</div>
</body>
</html>
body {
background-color: black;
color: white;
}
.grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-auto-rows: auto;
grid-gap: 20px;
//border: 1px solid white;
}
.blurBox {
grid-row: 1 / 1;
grid-column: 1 / 1;
background: linear-gradient(-45deg, red, blue);
filter: blur(5px);
border-radius: 5px;
}
.inputBox {
grid-row: 1 / 1;
grid-column: 1 / 1;
margin: 7px;
background: black;
border: 1px solid white;
border-radius: 5px;
z-index: 1;
}
.fName {
margin: 20px;
border: 1px solid white;
}
.lName {
margin: 20px;
border: 1px solid white;
}