The animations in my form do not work properly - html

Question

Ok so I was following a youtube tutorial for an HTML and CSS form that gave animations. Here is the entire HTML for it..
<div class="hero">
<div class="form-box">
<div class="button-box">
<div id="btn"></div>
<button type="button" class="toggle-btn" onclick="login()">Login</button>
<button type="button" class="toggle-btn" onclick="signup()">Signup</button>
</div>
<div class="social-icons">
<img src="../images/google-logo.png">
</div>
<form id="login" class="input-groups">
<input id="usernameL" type="text" class="input-field" placeholder="Userid" required>
<input id="passL" type="text" class="input-field" placeholder="password" required>
<input type="checkbox" class="chech-box"><span>Remember Me</span>
<button type="submit" class="submit-btn">Login</button>
</form>
<form id="signup" class="input-groups">
<input id="usernameSP" type="text" class="input-field" placeholder="Userid" required>
<input id="emailSP" type="email" class="input-field" placeholder="Email" required>
<input id="passSP" type="text" class="input-field" placeholder="password" required>
<input type="checkbox" class="chech-box"><span>I agree to terms and conditions</span>
<button type="submit" class="submit-btn">SignUp!</button>
</form>
</div>
</div>
<script>
var x= document.getElementById("login");
var y= document.getElementById("signup");
var z= document.getElementById("btn");
function signup(){
x.style.left ="-480px";
y.style.left ="50px";
z.style.left ="110px";
}
function login(){
x.style.left ="50px";
y.style.left ="-450px";
z.style.left ="0";
}
</script>
There is also a js file that called functions as login so I thought that was changed the problem and I changed it to login1 in js file but that didn't do anything...
I'm pretty sure my CSS is also proper so I'm not sure I understand what the problem is..
* {
margin: 0;
padding: 0;
}
.hero {
height: 100%;
width: 100%;
background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
url("../images/citybanner.jpg");
background-position: center;
background-size: cover;
position: absolute;
}
.form-box {
width: 380px;
height: 480px;
position: relative;
margin: 6% auto;
background: white;
padding: 5px;
overflow: hidden;
}
.button-box {
width: 220px;
margin: 35px auto;
position: relative;
box-shadow: 0 0 20px 9px #ff61241f;
border-radius: 30px;
}
.toggle-btn {
padding: 10px 30px;
cursor: pointer;
background: transparent;
border: 0;
outline: none;
position: relative;
}
#btn {
top: 0;
left: 0;
position: absolute;
width: 110px;
height: 100%;
background: linear-gradient(to right, #ff105f, #ffad06);
border-radius: 30px;
transition: 0.5s;
}
.social-icons {
margin: 30px auto;
text-align: center;
}
.social-icons img {
width: 30px;
border-radius: 50px;
}
.input-group{
top: 180px;
position: absolute;
width: 280px;
transition: .5s;
}
.input-field{
width: 100px;
padding: 10px 0;
margin: 5px 0;
border-left: 0;
border-top: 0;
border-right: 0;
border-bottom: 1px solid #999;
outline: none;
background: transparent;
}
.submit-btn{
width: 85%;
padding: 10px 30px;
cursor:pointer;
display: block;
margin:auto;
background: linear-gradient(to right, #ff105f, #ffad06);
border: 0;
outline: none;
border-radius: 30px;
}
.chech-box{
margin: 30px 10px 30px 0;
}
span{
color: #777;
font-size: 12px;
bottom: 64px;
position: absolute;
}
#login{
left: 50px;
}
#signup{
left: 450px;
}
The form itself. The login and signup buttons work where the color gradient changes but the actual content of the form doesn't change.