Step 1: Save your Template before you try something, it will help you when something goes wrong with your editing.
Step 2: Next goto >> Design >> Edit Html >> search for </b:skin> >> and paste this code above it
/* Post images with CSS animated captions by Blogger Bits */
#post-image {
}
#figure {
position:relative;
float:left;
margin:10px;
overflow:hidden;
padding: 1px;
}
#figure:hover {
-moz-box-shadow:0 0 20px rgba(0,0,0,0.75);
-webkit-box-shadow:0 0 20px rgba(0,0,0,0.75);
box-shadow:0 0 20px rgba(0,0,0,0.75);
}
#figure .caption {
position:absolute;
bottom:0;
left:0;
opacity: 0.75;
margin-bottom:-115px;
-webkit-transition: margin-bottom;
-webkit-transition-duration: 400ms;
-webkit-transition-timing-function: ease-out;
-moz-transition-property: margin-bottom;
-moz-transition-duration: 400ms;
-moz-transition-timing-function: ease-out;
-o-transition-property: margin-bottom;
-o-transition-duration: 400ms;
transition: margin-bottom;
transition-duration: 400ms;
transition-timing-function: ease-out;
}
#figure:hover .caption {
margin-bottom:0px;
}
#post-image .caption {
width:100%;
height:90px;
padding:10px;
background:#111;
color:#fff;
font-family: Arial, Helvetica, sans-serif;
}
#post-image .caption b {
text-shadow: 0px 2px 0px #000;
}
#post-image .caption {
color: #ddd;
line-height: 24px;
font-size: 14px;
text-shadow: 0px 2px 0px #000;
}
Step 3: Then while you are uploading a image in your post, upload the image, copy the link and paste it here in this code
<span class="Apple-style-span" style="border-collapse: separate; color: black; font-family: 'Times New Roman'; font-size: small; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px;"><pre><div id="post-image">
<div id='figure'>
<img src="image-link-url here"/>
<span class='caption'>
<b>Image Title here</b>
Image description goes here.
</span>
</div>
</div></pre></span>
DEMO