There are plenty of JavaScript-based libraries that show tooltips when you hover your mouse over a certain area of a web page. Some are rather plain, some allow the tooltip
This one is very interesting,
HTML and CSS only
.help-tip {
position: absolute;
top: 18px;
left: 18px;
text-align: center;
background-color: #BCDBEA;
border-radius: 50%;
width: 24px;
height: 24px;
font-size: 14px;
line-height: 26px;
cursor: default;
}
.help-tip:before {
content: '?';
font-weight: bold;
color: #fff;
}
.help-tip:hover span {
display: block;
transform-origin: 100% 0%;
-webkit-animation: fadeIn 0.3s ease-in-out;
animation: fadeIn 0.3s ease-in-out;
}
.help-tip span {
display: none;
text-align: left;
background-color: #1E2021;
padding: 5px;
width: 200px;
position: absolute;
border-radius: 3px;
box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.2);
left: -4px;
color: #FFF;
font-size: 13px;
line-height: 1.4;
}
.help-tip span:before {
position: absolute;
content: '';
width: 0;
height: 0;
border: 6px solid transparent;
border-bottom-color: #1E2021;
left: 10px;
top: -12px;
}
.help-tip span:after {
width: 100%;
height: 40px;
content: '';
position: absolute;
top: -40px;
left: 0;
}
This is the inline help tip!