У вас пожалуй форма некрасивая, попробуйте написать
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
body {
font-family: Arial, Helvetica, sans-serif;
}
* {
box-sizing: border-box;
}
/* style the container */
.container {
position: relative;
border-radius: 5px;
background-color: #f2f2f2;
padding: 20px 0 30px 0;
}
/* style inputs and link buttons */
input,
.btn {
width: 100%;
padding: 12px;
border: none;
border-radius: 4px;
margin: 5px 0;
opacity: 0.85;
display: inline-block;
font-size: 17px;
line-height: 20px;
text-decoration: none; /* remove underline from anchors */
}
input:hover,
.btn:hover {
opacity: 1;
}
/* add appropriate colors to fb, twitter and google buttons */
.fb {
background-color: #3B5998;
color: white;
}
.twitter {
background-color: #55ACEE;
color: white;
}
.google {
background-color: #dd4b39;
color: white;
}
/* style the submit button */
input[type=submit] {
background-color: #4CAF50;
color: white;
cursor: pointer;
}
input[type=submit]:hover {
background-color: #45a049;
}
/* Two-column layout */
.col {
float: left;
width: 50%;
margin: auto;
padding: 0 50px;
margin-top: 6px;
}
/* Clear floats after the columns */
.row:after {
content: "";
display: table;
clear: both;
}
/* vertical line */
.vl {
position: absolute;
left: 50%;
transform: translate(-50%);
border: 2px solid #ddd;
height: 175px;
}
/* text inside the vertical line */
.vl-innertext {
position: absolute;
top: 50%;
transform: translate(-50%, -50%);
background-color: #f1f1f1;
border: 1px solid #ccc;
border-radius: 50%;
padding: 8px 10px;
}
/* hide some text on medium and large screens */
.hide-md-lg {
display: none;
}
/* bottom container */
.bottom-container {
text-align: center;
background-color: #666;
border-radius: 0px 0px 4px 4px;
}
/* Responsive layout - when the screen is less than 650px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 650px) {
.col {
width: 100%;
margin-top: 0;
}
/* hide the vertical line */
.vl {
display: none;
}
/* show the hidden text on small screens */
.hide-md-lg {
display: block;
text-align: center;
}
}
</style>
</head>
<body>
<div class="container">
<form action="/action_page.php">
<div class="row">
<h2 style="text-align:center">Login with Social Media or Manually</h2>
<div class="vl">
<span class="vl-innertext">or</span>
</div>
<div class="col">
<a href="#" class="fb btn">
<i class="fa fa-facebook fa-fw"></i> Login with Facebook
</a>
<a href="#" class="twitter btn">
<i class="fa fa-twitter fa-fw"></i> Login with Twitter
</a>
<a href="#" class="google btn"><i class="fa fa-google fa-fw">
</i> Login with Google+
</a>
</div>
<div class="col">
<div class="hide-md-lg">
<p>Or sign in manually:</p>
</div>
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<input type="submit" value="Login">
</div>
</div>
</form>
</div>
<div class="bottom-container">
<div class="row">
<div class="col">
<a href="#" style="color:white" class="btn">Sign up</a>
</div>
<div class="col">
<a href="#" style="color:white" class="btn">Forgot password?</a>
</div>
</div>
</div>
</body>
</html>