Hai sob, apa kabar? Berhubung blog Technology Tower baru saja mengganti template dan kebetulan template ini memakai animasi loading halaman, maka saya akan berbagi Tutorial untuk membuat animasi loading tersebut, Tutorial Membuat Animasi Loading Blog dengan CSS3 dalam 6 Variasi Loader.
Ok, langsung aja di simak tutorial ini 

1. Masuk ke Dashboard Blogger, klik Template lalu pilih Edit HTML
2. Ini adalah point terpenting, pertama cek dulu template blogmu apakah sudah ada script jquery didalamnya atau belum, jika belum ada silahkan copy kode ini: 
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js' type='text/javascript'/>
 dan pastekan tepat diatas kode  <b:skin><![CDATA[ 
3. Ikuti petunjuk dibawah ini sesuai dengan style animasi loading yang kamu suka

# Style 1
membuat animasi loading blog css3
Demo

Masukkan Kode berikut tepat diatas kode  ]]></b:skin>  
/* X-Gen Loader */
#xgenloader-screen {z-index:999999;background:#000;width:100%;height:100%;position:fixed !important;position:absolute;top:0;right:0;bottom:0;left:0;text-shadow:none;}
/* DEMO 1 */
#horizontal-load body:after {
    content: "";
    z-index: -1;
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    background: -webkit-radial-gradient(center center, circle cover, rgba(0,0,0,0), rgba(0,0,0,0.5));
    background: -moz-radial-gradient(center center, circle cover, rgba(0,0,0,0), rgba(0,0,0,0.5));
    background: -ms-radial-gradient(center center, circle cover, rgba(0,0,0,0), rgba(0,0,0,0.5));
    background: -o-radial-gradient(center center, circle cover, rgba(0,0,0,0), rgba(0,0,0,0.5));
    background: radial-gradient(center center, circle cover, rgba(0,0,0,0), rgba(0,0,0,0.5));
}
#horizontal-load .bar {
font-size: 20px;
    width: 10em;
    height: 1em;
    position: relative;
    margin: 100px auto;
    border-radius: .5em;
    background: rgba(255,255,255,0.6);
    box-shadow:
        0 0 0 .05em rgba(100,100,100,0.075),
        0 0 0 .25em rgba(0,0,0,0.1),
        inset 0 .1em .05em rgba(0,0,0,0.1),
        0 .05em rgba(255,255,255,0.7);
}
#horizontal-load .bar:after {
    content: "Please wait.";
    position: absolute;
    left: 25%;
    top: 150%;
    font-family: 'Carrois Gothic', sans-serif;
    font-size: 1em;
    color: #555;
    text-shadow: 0 .05em rgba(255,255,255,0.7);
}
#horizontal-load .bar .sphere {
    border-radius: 50%;
    width: 1em;
    height: 100%;
    background: -webkit-linear-gradient(#eee, #ddd);
    background: -moz-linear-gradient(#eee, #ddd);
    background: -ms-linear-gradient(#eee, #ddd);
    background: -o-linear-gradient(#eee, #ddd);
    background: linear-gradient(#eee, #ddd);
    box-shadow:
        inset 0 .15em .1em rgba(255,255,255,0.3),
        inset 0 -.1em .15em rgba(0,0,0,0.15),
        0 0 .25em rgba(0,0,0,0.3);
    display: block;
    -webkit-animation: slide 1.75s ease-in-out infinite alternate;
    -moz-animation: slide 1.75s ease-in-out infinite alternate;
    -ms-animation: slide 1.75s ease-in-out infinite alternate;
    -o-animation: slide 1.75s ease-in-out infinite alternate;
    animation: slide 1.75s ease-in-out infinite alternate;
}
@-webkit-keyframes slide {
    to { margin-left: 90%; }
}
@-moz-keyframes slide {
    to { margin-left: 90%; }
}
@-ms-keyframes slide {
    to { margin-left: 90%; }
}
@-o-keyframes slide {
    to { margin-left: 90%; }
}
@keyframes slide {
    to { margin-left: 90%; }
}

Lalu letakkan kode berikut tepat dibawah kode <body>
<!-- Start Andi-Techno.blogspot.com Loader -->
<script type='text/javascript'>
//<![CDATA[
$(function() {
    setTimeout(function() {
        $('#xgenloader-screen').fadeOut();
    }, 5000);
});
//]]>
</script>
<div id='xgenloader-screen'><div id="horizontal-load"><div class="bar">
<i class="sphere"></i>
</div></div>
</div>
<!-- End Loader -->

Klik Pratinjau, kalau loading muncul silahkan simpan template