style.css

html,body{
	margin:0;
	padding: 0;
	height: 100%;
}

.signupform{
	background-color: #efefee;
	height: 100%;
	display: flex;
	justify-content: center;
    align-items: center;
}
.box{
	min-height: 450px;
    padding: 20px 25px;
    max-height: 100%;
    width: 450px;
    background: #fff;
    overflow: auto;
    box-sizing: border-box;
}
.signupform .box form{
	display: flex;
	flex-direction: column;
}
.form-baba input{
	border:none;
	border-bottom: 1px solid #ddd;
	padding: 5px 5px;
	outline: none;
    font-size: 15px;
    width: 100%;
    margin-top: 7px;
}
.form-baba span{
    visibility: hidden;
    color: #f44251;
    font-size: 13px;
}

.form-baba.error span{
    visibility: visible;
}

input[type="submit"]{
	width: 80px;
	height: 35px;
	background-color: #4285f4;
	color: #fff;
	font-size: 18px;
	border:none;
	border-radius: 5px;
	margin-top: 10px;
}

.signupform .box img{
	width: 150px;
}
.signupform .box h3{
	font-size: 25px;
    margin: 0;
    margin-top: 10px;
}
.signupform .box .tex{
	font-size: 18px;
	margin: 0;
	margin-top: 7px;
	margin-bottom: 20px;
}


.form-baba.success input{
	border-bottom: 2px solid #42f46e;
}

.form-baba.error input{
	border-bottom: 2px solid #f44251;
}