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HTML 

              
                <body>
    <!-- screen one -->
    <div class="screen1_container">
        <!-- The nav bar with logo and menu items-->
        <nav class="screen1_menu_container">
            <h4>Logo</h4>
            <label for="screen1_menu_check" class="screen1_menu_btn">

                <!-- checkbox to track when the hamburger menu is clicked on -->
                <input 
                class="screen1_input"
                type="checkbox"
                id="screen1_menu_check"
                />

                <!-- the hamburger menu -->
                <div class="screen1_menu_hamburger"></div>

                <!-- menu items -->
                <ul class="screen1_menu_items">
                    <li>Home</li>
                    <li> 
                        <!-- sub menu items -->
                        <label for="screen1_submenu_check">
                            <p>About &downarrow; </p>

                            <input 
                            type="checkbox"
                            id="screen1_submenu_check"
                            class="submenu_input"
                            />
                            
                            <ul class="screen1_submenu">
                                <li>Careers</li>
                                <li>Policy</li>
                                <li>
                                    <!-- second level sub menu items -->
                                    <label for="screen1_submenu2_check">
                                        <p>More &downarrow; </p>
            
                                        <input 
                                        type="checkbox"
                                        id="screen1_submenu2_check"
                                        class="submenu2_input"
                                        />
                                        
                                        <ul class="screen1_submenu2">
                                            <li>Office</li>
                                            <li>Hangouts</li>
                                        </ul>
                                    </label>
                                </li>
                            </ul>
                        </label>
                       
                    </li>
                    <li>Contact</li>
                </ul>
            </label>
        </nav>

        <!-- The page body content for screen one -->
        <div class="page_content">
            <h3>This is the first screen</h3>
            <p>We are creating animated mobile menus</p>
        </div>
    </div>
    <!-- end of screen one -->


    <!-- screen two -->
    <div class="screen2_container">
        <!-- The nav bar with logo and menu items-->
        <nav class="screen2_menu_container">
            <h4>Logo</h4>
            <label for="screen2_menu_check" class="screen2_menu_btn">

                <!-- checkbox to track when the hamburger menu is clicked on -->
                <input 
                type="checkbox"
                id="screen2_menu_check"
                class="screen2_input"
                />

                <!-- the hamburger menu -->
                <div class="screen2_menu_hamburger"></div>

                <!-- menu items -->
                <ul class="screen2_menu_items">
                    <li>Home</li>
                    <li>About</li>
                    <li>Contact</li>
                </ul>
            </label>
        </nav>

        <!-- The page body content for screen two -->
        <div class="page_content">
            <h3>This is the second screen</h3>
            <p>We are creating animated mobile menus</p>
        </div>
    </div>
    <!-- end of screen two -->
</body>
!

CSS 

              
                *{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    column-gap: 40px;
    min-height: 100vh;
    color: white;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

@media screen and (max-width: 600px){
    body{
        flex-direction: column;
        row-gap: 40px;
        margin-top: 40px;
    }
}

/*screen one styles  */

.screen1_container{
    width: 350px;
    height: 700px;
    background-color: #533557;
    position: relative;
    overflow: hidden;
    border: 15px solid rgb(54, 53, 53);
    border-top: 30px solid rgb(54, 53, 53);
    border-bottom: 30px solid rgb(54, 53, 53);
    border-radius: 60px;
}
.screen1_menu_container{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f1d6f5;
    color: #533557;
    padding: 0 10px;
}
.screen1_menu_btn{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    transition: all .5s ease-in-out;
}
.screen1_menu_hamburger{
    width: 20px;
    height: 2px;
    background-color: #533557;
    border-radius: 5px;
    z-index: 10;
    transition: all .5s ease;
}

.screen1_menu_hamburger::before,
.screen1_menu_hamburger::after{
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: #533557;
    border-radius: 5px;
    transition: all .5s ease;
}
.screen1_menu_hamburger::before{
    transform: translateY(-6px);
}
.screen1_menu_hamburger::after{
    transform: translateY(6px);
}
.screen1_menu_items{
    background:  #f1d6f5;
    color: #533557;
    position: absolute;
    left: 100%;
    height: 100%;
    width: 70%;
    padding-top: 70px;
    padding-left: 20%;
    top: 0;
    transition: all .5s ease-in-out;
}
.screen1_menu_items li{
    padding: 10px 0;
    /* text-align: center; */
    transition: all .2s ease; 
    list-style-type: none;
    cursor: pointer;
}

/* animation */
.screen1_input:checked ~.screen1_menu_hamburger{
    transform: translateX(-50px);
    background: transparent;
}
.screen1_input:checked ~.screen1_menu_hamburger::before{
    transform: rotate(45deg) translate(35px, -35px);
}
.screen1_input:checked ~.screen1_menu_hamburger::after{
    transform: rotate(-45deg) translate(35px, 35px);
}
.screen1_input:checked ~.screen1_menu_items{
    left: 40%;
}
.screen1_input{
    display: none;
}
.page_content{
    text-align: center;
    margin-top: 3em;
}
.page_content h3{
    padding-bottom: 10px;
}


/* sub menu styles */
.submenu_input{
    display: none;
}
.screen1_submenu{
    position:relative;
    left: 100%;
    transition: all .5s ease-in-out;
    height: 0;
    padding-left: 10%;
}
.screen1_submenu li{
    text-decoration: underline;
}
.submenu_input:checked ~.screen1_submenu{
    left: 0;
    height: auto;
    margin-top: 10px;
}

/* second level sub menu styles */
.screen1_submenu2{
    position:relative;
    left: 100%;
    transition: all .5s ease-in-out;
    height: 0;
    padding-left: 10%;
}
.submenu2_input{
    display: none;
}
.submenu2_input:checked ~.screen1_submenu2{
    left: 0;
    height: auto;
    margin-top: 10px;
}

/* media query */
@media screen and (max-width: 600px){
    .screen1_container{
        width: 300px;
        height: 600px;
    }
}

/*screen two styles  */
.screen2_container{
    width: 350px;
    height: 700px;
    position: relative;
    overflow: hidden;
    color: rgb(54, 53, 53);
    border: 15px solid rgb(54, 53, 53);
    border-top: 30px solid rgb(54, 53, 53);
    border-bottom: 30px solid rgb(54, 53, 53);
    border-radius: 60px;
}
.screen2_menu_container{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    background-color: #533557;
    color: white;
}
.screen2_menu_btn{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    transition: all .5s ease-in-out;
}
.screen2_menu_hamburger{
    width: 20px;
    height: 2px;
    background-color: white;
    border-radius: 5px;
    z-index: 10;
    transition: all .5s ease;
}
.screen2_menu_hamburger::before,
.screen2_menu_hamburger::after{
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: white;
    border-radius: 5px;
    transition: all .5s ease;
}
.screen2_menu_hamburger::before{
    transform: translateY(-6px);
}
.screen2_menu_hamburger::after{
    transform: translateY(6px);
}

.screen2_input:checked ~.screen2_menu_hamburger::before{
    transform: rotate(45deg) translate(35px, -35px);
}
.screen2_input:checked ~.screen2_menu_hamburger::after{
    transform: rotate(-45deg) translate(35px, 35px);
}
.screen2_input:checked ~.screen2_menu_hamburger{
    transform: translateX(-50px);
    background: transparent;
}

.screen2_menu_items{
    position: absolute;
    top: -100%;
    background:  #533557;
    height: 100%;
    width: 100%;
    left: 0;
    transition: all .5s ease-out; 
    padding-top: 50px;
}
.screen2_menu_items li{
    border-bottom: .5px solid rgb(182, 181, 181);
    padding: 24px 0;
    text-align: center;
    transition: all .2s ease-out; 
    cursor: pointer;
}
.screen2_menu_items li:hover{
    letter-spacing: 2px;
    opacity: .6;
}

.screen2_input:checked ~.screen2_menu_items{
    top:0;
}
.screen2_input{
    display: none;
}

@media screen and (max-width: 600px){
    .screen2_container{
        width: 300px;
        height: 600px;
    }
}
!

JS
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