Codepen:
Github: https://github.com/furkangulsen98/HTML-CSS-JAVASCRIPT/tree/master/CSS%20Tooltip
HTML CODE:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>page</title>
<link rel="stylesheet" type="text/css" href="cssTooltip.css">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous">
</head>
<body>
<form>
<input type="text" placeholder="username" />
<div id="anim">
<span class="tooltip" data-tooltip="username must consist of 29 symbols.">?</span>
</div>
</form>
</body>
</html>
CSS CODE:
body {
background: #333;
overflow: hidden;
}
form {
display: flex;
justify-content: center;
align-items: center;
position: relative;
width: 100%;
height: 100vh;
}
input {
border: none;
width: 175px;
height: 30px;
outline: none;
padding-left: 10px;
font-weight: bold;
font-family: Verdana;
color: #ae3535;
border-radius: 15px 0px 0px 15px;
box-shadow: 0px 0px 30px #000;
}
.tooltip {
position: relative;
background: #ae3535;
padding: 9px 15px;
margin: 5px;
font-size: 15px;
border-radius: 100%;
color: #FFF;
font-family: Verdana;
}
.tooltip:before,
.tooltip:after {
position: absolute;
content: '';
opacity: 0;
transition: all 0.4s ease;
}
.tooltip:before {
border-width: 10px 8px 0 8px;
border-style: solid;
border-color: #ae3535 transparent transparent transparent;
top: -15px;
transform: translateY(20px);
}
.tooltip:after {
content: attr(data-tooltip);
background: #ae3535;
width: 160px;
height: 40px;
font-size: 12px;
top: -75px;
left: -10px;
padding: 10px;
border-radius: 5px;
letter-spacing: 1px;
transform: translateY(20px);
box-shadow: 0px 0px 30px rgba(0, 0, 0, 0.5);
}
.tooltip:hover::before,
.tooltip:hover::after {
opacity: 1;
transform: translateY(-2px);
}
#anim:hover {
animation: shake 400ms ease-in-out forwards;
}
@keyframes shake {
0% {
transform: rotate(5deg);
}
50% {
transform: rotate(-5deg);
}
70% {
transform: rotate(8deg);
}
100% {
transform: rotate(0deg);
}
}
TrueCodes 
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