Оформление ссылок

HTML:

<div class="container-1">    
	<a href="#link">ссылка</a>
</div>

CSS:

.container-1 a {
    background: linear-gradient(to bottom, #337AB7 0%, #337AB7 100%);
    background-position: 0 100%;
    background-repeat: repeat-x;
    background-size: 1px 1px;
    color: #000;
    text-decoration: none;
    padding-bottom: 2px;
}
 
.container-1 a:hover {
    background-image: url("data:image/svg+xml;charset=utf8,%3Csvg id='squiggle-link' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' xmlns:ev='http://www.w3.org/2001/xml-events' viewBox='0 0 20 4'%3E%3Cstyle type='text/css'%3E.squiggle{animation:shift .3s linear infinite;}@keyframes shift {from {transform:translateX(0);}to {transform:translateX(-20px);}}%3C/style%3E%3Cpath fill='none' stroke='%23337AB7' stroke-width='1' class='squiggle' d='M0,3.5 c 5,0,5,-2,10,-2 s 5,2,10,2 c 5,0,5,-2,10,-2 s 5,2,10,2'/%3E%3C/svg%3E");
    background-position: 0 100%;
    background-size: auto 4px;
    background-repeat: repeat-x;
    text-decoration: none;
}

HTML:

<div class="container-2">    
    <a href="#link">ссылка</a>
</div>

CSS:

.container-2 a {
    text-decoration: none;
    position: relative;
    display: inline-block;
    color: #000;
    transition: color .3s ease-out;
}
.container-2 a::before {
    content: "";
    position: absolute;
    z-index: -1;
    bottom: 0;
    left: 0;
    height: 1px;
    width: 100%;
    background: #337AB7;
    transition: height .3s ease-out;
}
 
.container-2 a:hover { 
    color: #fff; 
}
.container-2 a:hover::before {
    height: 100%;
}

HTML:

<div class="container-5">    
    <a href="#link">ссылка</a>
</div>

CSS:

.container-5 a {
	color: #337AB7;
	text-decoration: none;
	transition: color .2s ease;	
}
.container-5 a:hover {
	animation: blur 1s ease-out;
	color: #000;
}
@keyframes blur {
    from {
        text-shadow:0px 0px 10px #BFE2FF,
        0px 0px 10px #BFE2FF, 
        0px 0px 25px #BFE2FF,
        0px 0px 25px #BFE2FF,
        0px 0px 25px #BFE2FF,
        0px 0px 25px #337AB7,
        0px 0px 50px #337AB7,
        0px 0px 50px #337AB7;
	}
}

HTML:

<div class="container-6">    
    <a href="#link">ссылка</a>
</div>

CSS:

.container-6 a {
	position: relative;
	display: inline-block;
	text-decoration: none;
	color: #337AB7;
}
.container-6 a:hover {
	color: #000;
}
.container-6 a::before{
	content: "";
	width: 0;
	height: 100%;
	background-image: linear-gradient(to top, #BFE2FF 25%, transparent 40%);
	position: absolute;
	left: 0;
	z-index: -1;	
	transform: rotate(-1deg);
	transform-origin: left bottom;
	transition: width .1s ease-out;
}
.container-6 a:hover::before{
	width: 100%;
}