How to use css3 to create nice-looking buttons?

<div class="container fix">
    <h1>Animated Buttons <span>with CSS3 Transitions and Animations</span></h1>
    <div class="content">
        <div class="button-wrapper">
            <a href="#" class="a-btn">
                <span class="a-btn-text">Register now</span>
                <span class="a-btn-slide-text">It&#39;s free!</span>
                <span class="a-btn-icon-right"><span></span></span>
            </a>
            <a href="#" class="a-btn">
                <span class="a-btn-text">Become a member</span>
                <span class="a-btn-slide-text">Sign up!</span>
                <span class="a-btn-icon-right"><span></span></span>
            </a>
            <a href="#" class="a-btn">
                <span class="a-btn-text">Enter</span>
                <span class="a-btn-slide-text">Log in!</span>
                <span class="a-btn-icon-right"><span></span></span>
            </a>
            <a href="#" class="a-btn">
                <span class="a-btn-text">Get an account</span>
                <span class="a-btn-slide-text">For free!</span>
                <span class="a-btn-icon-right"><span></span></span>
            </a>
        </div>
    </div>
</div>

/*style2.css*/
.a-btn{
    background:#80a9da;
    background:-webkit-gradient(linear,left top,left bottom,color-stop(#80a9da,0),color-stop(#6f97c5,1));
    background:-webkit-linear-gradient(top, #80a9da 0%, #6f97c5 100%);
    background:-moz-linear-gradient(top, #80a9da 0%, #6f97c5 100%);
    background:-o-linear-gradient(top, #80a9da 0%, #6f97c5 100%);
    background:linear-gradient(top, #80a9da 0%, #6f97c5 100%);
    filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#80a9da', endColorstr='#6f97c5',GradientType=0 );
    padding-left:90px;
    padding-right:105px;
    height:90px;
    display:inline-block;
    position:relative;
    border:1px solid #5d81ab;
    -webkit-box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 3px rgba(0,0,0,0.2);
    -moz-box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 3px rgba(0,0,0,0.2);
    box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 3px rgba(0,0,0,0.2);
    -webkit-border-radius:4px;
    -moz-border-radius:4px;
    border-radius:4px;
    float:left;
    clear:both;
    margin:10px 0px;
    overflow:hidden;
    -webkit-transition:box-shadow 0.3s ease-in-out;
    -moz-transition:box-shadow 0.3s ease-in-out;
    -o-transition:box-shadow 0.3s ease-in-out;
    transition:box-shadow 0.3s ease-in-out;
}
.a-btn img{
    position:absolute;
    left:15px;
    top:13px;
    border:none;
    -webkit-transition:all 0.3s ease-in-out;
    -moz-transition:all 0.3s ease-in-out;
    -o-transition:all 0.3s ease-in-out;
    transition:all 0.3s ease-in-out;
}
.a-btn .a-btn-slide-text{
    position:absolute;
    font-size:36px;
    top:18px;
    left:18px;
    color:#bde086;
    text-shadow:0px 1px 1px rgba(0,0,0,0.3);
    -webkit-transform:scale(0);
    -moz-transform:scale(0);
    -ms-transform:scale(0);
    -o-transform:scale(0);
    transform:scale(0);
    opacity:0;
    -webkit-transition:all 0.3s ease-in-out;
    -moz-transition:all 0.3s ease-in-out;
    -o-transition:all 0.3s ease-in-out;
    transition:all 0.3s ease-in-out;
}
.a-btn-text{
    padding-top:13px;
    display:block;
    font-size:30px;
    text-shadow:0px -1px 1px #5d81ab;
}
.a-btn-text small{
    display:block;
    font-size:11px;
    letter-spacing:1px;
}
.a-btn-icon-right{
    position:absolute;
    right:0px;
    top:0px;
    height:100%;
    width:80px;
    border-left:1px solid #5d81ab;
    -webkit-box-shadow:1px 0px 1px rgba(255,255,255,0.4) inset;
    -moz-box-shadow:1px 0px 1px rgba(255,255,255,0.4) inset;
    box-shadow:1px 0px 1px rgba(255,255,255,0.4) inset;
}
.a-btn-icon-right span{
    width:38px;
    height:38px;
    opacity:0.7;
    -webkit-border-radius:20px;
    -moz-border-radius:20px;
    border-radius:20px;
    position:absolute;
    left:50%;
    top:50%;
    margin:-20px 0px 0px -20px;
    border:1px solid rgba(0,0,0,0.5);
    background:#5b5b5b url(../images/arrow_down.png) no-repeat center center;
    -webkit-box-shadow:0px 1px 1px rgba(255,255,255,0.3) inset, 0px 1px 2px rgba(255,255,255,0.5);
    -moz-box-shadow:0px 1px 1px rgba(255,255,255,0.3) inset, 0px 1px 2px rgba(255,255,255,0.5);
    box-shadow:0px 1px 1px rgba(255,255,255,0.3) inset, 0px 1px 2px rgba(255,255,255,0.5);
    -webkit-transition:all 0.3s ease-in-out;
    -moz-transition:all 0.3s ease-in-out;
    -o-transition:all 0.3s ease-in-out;
    transition:all 0.3s ease-in-out;
}
.a-btn:hover{
    -webkit-box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 5px rgba(0,0,0,0.4);
    -moz-box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 5px rgba(0,0,0,0.4);
    box-shadow:0px 1px 1px rgba(255,255,255,0.8) inset, 1px 1px 5px rgba(0,0,0,0.4);
}
.a-btn:hover img{
    opacity:0;
}
.a-btn:hover .a-btn-slide-text{
    opacity:1;
    -webkit-transform:scale(1);
    -moz-transform:scale(1);
    -ms-transform:scale(1);
    -o-transform:scale(1);
    transform:scale(1);
}
.a-btn:hover .a-btn-icon-right span{
    opacity:1;
    background-color:#bc3532;
}
.a-btn:active{
    position:relative;
    top:1px;
    background:#5d81ab;
    -webkit-box-shadow:1px 1px 2px rgba(0,0,0,0.4) inset;
    -moz-box-shadow:1px 1px 2px rgba(0,0,0,0.4) inset;
    box-shadow:1px 1px 2px rgba(0,0,0,0.4) inset;
    border-color:#80a9da;
}
.a-btn:active .a-btn-icon-right span{
    -webkit-transform:rotate(360deg);
    -moz-transform:rotate(360deg);
    -ms-transform:rotate(360deg);
    -o-transform:rotate(360deg);
    transform:rotate(360deg);
}