CSS

css glow effect

div {
    width: 150px;
    height: 150px;
    background-color: #fff;

    box-shadow: 120px 80px 40px 20px #0ff;
    /* in order: x offset, y offset, blur size, spread size, color */
    /* blur size and spread size are optional (they default to 0) */
}

html glow on hover

element {
  box-shadow:none;
}
element:hover, element:active {
  box-shadow: inset 0 0 10px #(color of the glow you want);
}