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HTML

              
                <div class="main">
  <div class="menu">
    <button id="menu-button">
      <svg width="60px" height="60px">
        <polyline id="top" points="15,15 45,15"/>
        <polyline id="middle1" points="15,30 45,30"/>
        <polyline id="middle2" points="15,30 45,30"/>
        <polyline id="bottom" points="15,45 45,45"/>
      </svg>
    </button>
    
    <div class="menu-content">
      
    </div>
  </div>
  
  <div class="main-login">
    <div class="login-header">
      <div class="login">
        Login
      </div>
      <div class="sign-up">
        Sign Up
      </div>
    </div>

    <div class="login-main">
      <form>
        <div class="username liu">
          <h>Username:</h>
          <br>
          <input id="li-un" type="text" placeholder="Username..." required="true">
        </div>
      
        <div class="password lip">
          <h>Password:</h>
          <br>
          <input id="li-pw" type="password" placeholder="Password..." required="true">
        </div>
        <div class="submit">
          <div class="slid">
            <input class="sli" type="checkbox">
            <p>Stay logged in</p>
          </div>
          <input class="lisub" type="button" value="Login">
        </div>
      </form>
    </div>
    
    <div class="signup-main">
      <form>
        <div class="username suu">
          <h>Username:</h>
          <br>
          <input id="su-un" type="text" placeholder="Username..." required="true">
        </div>
      
        <div class="email">
          <h>Email:</h>
          <br>
          <input id="su-em" type="email" placeholder="Email..." required="true">
        </div>
      
        <div class="password sup">
          <h>Password:</h>
          <br>
          <input id="su-pw" type="password" placeholder="Password..." required="true">
        </div>
        <div class="password supc">
          <h>Confirm Password:</h>
          <br>
          <input id="su-cp" type="password" placeholder="Password..." required="true">
        </div>
        <div class="submit">
          <div class="slid">
            <input class="sli" type="checkbox">
            <p>Stay logged in</p>
          </div>
          <input class="susub" type="button" value="Sign Up">
        </div>
      </form>
    </div>
  </div>
  <div id="logged_in">
    <h1>Logged In :)</h1>
  </div>
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400&display=swap');

html, body {
  background: linear-gradient(120deg, #9ff, #9f5);
  margin: 0px;
  padding: 0px;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.main {
  width: 100vw;
  height: 100%;
  display: flex;
  text-align: center;
  justify-content: center;
}

.menu {
  position: absolute;
  right: 10px;
  top: 10px;
}

#menu-button {
  width: 60px;
  height: 60px;
  padding: 0px;
  background-color: orange;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}

#top,
#middle1,
#middle2,
#bottom {
  fill: none;
  stroke: white;
  stroke-width: 5px;
	transform-origin: center;
  transition: 0.2s;
}

.menu-content {
  background-color: #fff;
  width: 200px;
  height: 0px;
  position: absolute;
  top: 0px;
  right: 70px;
  z-index: 10;
  border-radius: 5px;
  transition: 0.3s;
  filter: drop-shadow(0px 2px 4px #0005);
}

.expanded {
  height: 200px;
}

.main-login {
  background: #fff;
  width: 300px;
  border-radius: 20px;
  transition: 0.5s;
  filter: drop-shadow(0px 2px 6px #0005);
}

.login-header {
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
  background: #fff;
  border-bottom: solid 1px #ddd;
  width: 100%;
  height: 40px;
}

.login {
  padding-top: 8px;
  padding-left: 8px;
  position: relative;
  border-top-left-radius: 20px;
  background: #fff;
  border-right: solid 1px #ddd;
  width: calc(50% - 8px);
  height: 32px;
  float: left;
  cursor: pointer;
  transition: 0.3s;
  font-family: roboto;
  color: #444;
  font-size: 18px;
}

.sign-up {
  padding-top: 8px;
  padding-right: 8px;
  position: relative;
  border-top-right-radius: 20px;
  background: #fff;
  width: calc(50% - 9px);
  height: 32px;
  float: left;
  cursor: pointer;
  transition: 0.3s;
  font-family: roboto;
  color: #444;
  font-size: 18px;
}

.login:hover,
.sign-up:hover {
  background: #ddd;
}

.login-main,
.signup-main {
  transition: 1s;
}

.username,
.password,
.email {
  color: #111;
  width: 300px;
  text-align: left;
  padding-left: 20px;
  margin-top: 30px;
}

h {
  font-family: roboto;
  font-size: 15px;
}

input {
  width: 250px;
  height: 40px;
  border: none;
  outline: none;
  color: #444;
  padding-left: 10px;
  border-radius: 20px;
  border-top-left-radius: 0px;
  background-color: #ddd;
}

input:focus {
  border: solid 2px #bbb;
  width: 246px;
  height: 36px;
  padding-left: 8px;
}

.submit {
  text-align: right;
  padding-right: 20px;
  margin-top: 20px;
}

.slid {
  text-align: left;
  padding-left: 20px;
  position: absolute;
  margin-top: 10px;
}

.sli {
  width: 12px !important;
  height: 12px !important;
}

.slid p {
  margin-top: -17px;
  padding-left: 23px;
  font-family: roboto;
  color: #444;
  font-size: 12px;
}

.lisub,
.susub {
  width: 80px !important;
  height: 40px !important;
  background-color: #77f;
  border: none;
  font-family: roboto;
  font-size: 15px;
  border-radius: 20px;
  cursor: pointer;
}

.lisub:hover,
.susub:hover {
  background-color: #88f;
}

.lisub:active,
.susub:active {
  background-color: #99f;
}

#logged_in {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 100%;
  font-family: cursive, roboto, sans serif;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0000;
  transition: 0.5s;
}
              
            
!

JS

              
                var username = localStorage.getItem("name");
var password = localStorage.getItem("pass");
var typedUsernameLI = $("#li-un");
var typedPasswordLI = $("#li-pw");
var typedUsernameSU = $("#su-un");
var typedEmailSU = $("#su-em");
var typedPasswordSU = $("#su-pw");
var typedConfPasswordSU = $("#su-cp");

function js() {
  if (username) {
    $(".login").css("border-bottom", "solid");
    $(".login").css("border-bottom-width", "3px");
    $(".login").css("border-bottom-color", "#99f");
    $(".login").css("height", "29px");
    $(".sign-up").css("border-bottom", "none");
    $(".sign-up").css("height", "32px");
    
    $(".signup-main").css("display", "none");
    $(".login-main").css("display", "block");
    
    $(".main-login").css("height", "300px");
    $(".main-login").css("margin-top", "calc(50vh - 150px)");
  }
  else {
    $(".sign-up").css("border-bottom", "solid");
    $(".sign-up").css("border-bottom-width", "3px");
    $(".sign-up").css("border-bottom-color", "#99f");
    $(".sign-up").css("height", "29px");
    $(".login").css("border-bottom", "none");
    $(".login").css("height", "32px");
    
    $(".login-main").css("display", "none");
    $(".signup-main").css("display", "block");
    
    $(".main-login").css("height", "480px");
    $(".main-login").css("margin-top", "calc(50vh - 240px)");
  }
};
    
$(".sign-up").on("click", function() {
  $(".sign-up").css("border-bottom", "solid");
  $(".sign-up").css("border-bottom-width", "3px");
  $(".sign-up").css("border-bottom-color", "#99f");
  $(".sign-up").css("height", "29px");
  $(".login").css("border-bottom", "none");
  $(".login").css("height", "32px");
    
  $(".login-main").css("display", "none");

  setTimeout( function() {
    $(".signup-main").css("display", "block");
  }, 500);
    
  $(".main-login").css("height", "480px");
  $(".main-login").css("margin-top", "calc(50vh - 240px)");
});
    
$(".login").on("click", function() {
  $(".login").css("border-bottom", "solid");
  $(".login").css("border-bottom-width", "3px");
  $(".login").css("border-bottom-color", "#99f");
  $(".login").css("height", "29px");
  $(".sign-up").css("border-bottom", "none");
  $(".sign-up").css("height", "32px");
    
  $(".signup-main").css("display", "none");
  
  setTimeout( function() {
    $(".login-main").css("display", "block");
  }, 500);
    
  $(".main-login").css("height", "300px");
  $(".main-login").css("margin-top", "calc(50vh - 150px)");
});

function login() {
  $(".lisub").on("click", function() {
    if (typedUsernameLI.val() == username) {
      if (typedPasswordLI.val() == password) {
        window.location = "#logged_in";
        setTimeout(function() {
          $("#logged_in").css("color", "#000");
          setTimeout(function() {
            $("#logged_in").css("color", "#0000");
          }, 3000);
        }, 500);
      }
      else if (typedPasswordLI.val() == "") {
        alert("Please enter a valid password");
      }
      else {
        alert("Incorrect password");
      }
    }
    else if (typedUsernameLI.val() == "") {
      alert("Please enter a valid username");
    }
    else {
      alert("Incorrect username");
    }
  });
};

function signup() {
  $(".susub").on("click", function() {
    if (typedUsernameSU.val() == "") {
      alert("Please enter a valid username");
    }
    else {
      if (typedEmailSU.val() == "") {
        alert("Please enter a valid email");
      }
      else {
        if (typedPasswordSU.val() == "") {
          alert("Please enter a valid password");
        }
        else {
          if (typedConfPasswordSU.val() == typedPasswordSU.val()) {
            localStorage.setItem("name", typedUsernameSU.val());
            localStorage.setItem("pass", typedPasswordSU.val());
            window.location = "#logged_in";
            setTimeout(function() {
              $("#logged_in").css("color", "#000");
              setTimeout(function() {
                $("#logged_in").css("color", "#0000");
              }, 3000);
            }, 500);
          }
          else {
            alert("Passwords do not match");
          }
        }
      }
    }
  });
};

var button = $("#menu-button");
var top1 = $("#top");
var middle1 = $("#middle1");
var middle2 = $("#middle2");
var bottom1 = $("#bottom");

button.click(function() {
  if (button.hasClass("open")) {
    button.removeClass("open");
    top1.css("transform", "none");
    middle1.css("transform", "none")
    middle2.css("transform", "none")
    bottom1.css("transform", "none");
    $(".menu-content").removeClass("expanded");
  } else {
    button.addClass("open");
    top1.css("transform", "scale(0,0)");
    middle1.css("transform", "rotate(45deg) scaleX(1.414213562)")
    middle2.css("transform", "rotate(-45deg) scaleX(1.414213562)")
    bottom1.css("transform", "scale(0,0)");
    $(".menu-content").addClass("expanded");
  }
});

js();
login();
signup();
              
            
!
999px

Console