html - Box-shadow side-effect blur not smooth. inner square in shadow -


i have slider on page change box-shadow values. @ high blurring values there unwanted box-like breaking shadow, when supposed smooth shadow way. there anyway avoid easily? help. p. s. need work 'inset' too.

enter image description here

div  {    width:200px;    height:200px;    border-radius: 100px;   background-color:blue;   -webkit-box-shadow: 169px 129px 300px -15px rgba(0,0,0,1);   -moz-box-shadow: 169px 129px 300px -15px rgba(0,0,0,1);   box-shadow: 169px 129px 300px -15px rgba(0,0,0,1);  }
<div></div>

for circular box-shadows blur cannot go above width & height of element. spread can though.

since element 200px * 200px, maximum blur value 200px.

have below @ example doesn't go above 200px , see creates box-shadow expected

div {    width: 200px;    height: 200px;    border-radius: 100px;    background-color: blue;    box-shadow: 169px 129px 200px -15px rgba(0, 0, 0, 1);  }
<div></div>

the spread value can alternatively go above element width , height , therefore can make bigger spreads.

div {    width: 200px;    height: 200px;    border-radius: 100px;    background-color: blue;    box-shadow: 169px 129px 0 250px rgba(0, 0, 0, 1);  }
<div></div>

you didn't need prefixes since css3 box-shadows supported now. caniuse

you can read more css box shadows in mdn documentation


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