label-in-input
by Semih Muyaoğlu
HTML
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<div class="container">
<div class="row">
<div class="col-12 mb-3 pl-0">
<div class="labelInsideBlock">
<span>AD SOYAD</span>
<input type="text" class="form-control labelInside" />
</div>
</div>
<div class="col-12 mb-3 pl-0">
<div class="labelInsideBlock">
<span>E-POSTA</span>
<input type="text" class="form-control labelInside" />
</div>
</div>
<div class="col-12 mb-3 pl-0">
<div class="labelInsideBlock"><span>ŞİFRE</span><input type="password" class="form-control labelInside" /></div>
</div>
<div class="col-12 pl-0">
<button type="button" class="btn btn-lg btn-success w-100">
GÖNDER
</button>
</div>
</div>
</div>
CSS
.labelInsideBlock > span {
font-family: verdana;
font-size: .6em;
z-index: 9999;
position: absolute;
left: 15px;
top: 10px;
color: #999 !important;
background:Red;
}
.labelInside {
position: relative;
font-family: verdana;
padding-top: 25px !important;
padding-bottom: 10px !important;
height: unset !important;
}