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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Alegreya+Sans" rel="stylesheet">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<h1>Pure CSS, Responsive vertical menu, to hamburger menu</h1>
<div class="wrap">
    <span class="cormen">
        <label for="cormid">Click to open menu</label>
        <input id="cormid" type="checkbox">
        <ul>
            <li>
                <div class="useropts">
                    <span class="details">
                        <div class="edit">Edit Details</div>
                        <div class="useredit">Edit Photo</div>
                    </span>
                    <span class="photo">
                        <div class="userphoto"></div>
                    </span>
                    <span class="cvs">
                        <div class="useredit">Online CV</div>
                        <div class="edit">Word CV</div>
                    </span>
                    <div>
            </li>
            <li><a href="#">Home</a></li>
            <li><a href="#">Invites</a></li>
            <li><a href="#">Search Jobs</a></li>
            <li><a href="#">Saved Jobs</a></li>
            <li>MAILBOX</li>
            <li><a href="#">Inbox</a></li>
            <li><a href="#">Outbox</a></li>
        </ul>
    </span>
    <div class="content">
        <p>I've been looking for, and unable to find, a menu that does this - goes from vertical to hamburger menu. </p>
        <p>So this is my attempt at making one. As an added bonus it's pure CSS, and requires no JS.</p>
        <p> Most of the CSS is styling only, and isn't required for it to function, I've marked that out in the code. So you can safely strip all that out and it will still function.</p>
        <p>The show/hide functionality is triggered by changing the state of the (hidden) checkbox, by clicking the label (which acts as the hamburger), this allows me to use the adjacent selector to expand/collapse the ul which cintains the menu: <code>span.cormen input[type="checkbox"]:checked + ul</code></p>
        <p>Resize this pane, or your browser to see it in action :D</p>

        <p>I've also done a <a href="https://codepen.io/Cormac-Maher/pen/zYGVPQa">Bootstrap 4 version</a> of this.</p>
    </div>
!

CSS 

              
                * {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}
body {
    font-family: "Alegreya Sans", sans-serif;
    font-size: 1.3rem;
    color: #666;
}
h1 {
    font-weight: lighter;
    color: #999;
}
.content {
    float: left;
    width: 80%;
    padding-left: 1rem;
}
.cormen input[type="checkbox"],
.cormen label {
    display: none;
}
.cormen {
    /*not really necessary, only used to position the menu on desktop, use your own preferred method */
    display: inline-block;
    width: 20%;
    float: left;
}
.cormen input[type="checkbox"] {
    display: none;
}

.cormen ul {
    list-style-type: none;
    width: 100%;
    margin: 0;
    /*styling only, below*/
    padding: 1rem 1rem 0 1rem;
    background-color: #fab81e;
    border-radius: 0.25rem;
    margin-bottom: 0.25rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
}
.cormen ul li {
    /*styling only, below*/
    padding-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.8);
}
.cormen ul li a {
    display: block;
    /*styling only, below*/
    text-decoration: none;
    color: #fff;
    font-size: 1.3rem;
    text-transform: initial;
    text-decoration: none;
}
.cormen ul li a::before {
    content: ">";
    margin-right: 0.5rem;
}
.cormen ul li a:hover {
    /*styling only, below*/
    text-decoration: none;
}
.useropts {
    display: flex;
    align-content: center;
    flex-direction: row;
    align-items: flex-end;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
}
span.details {
    order: 3;
    flex-grow: 1;
}
span.photo {
    order: 2;
}
span.cvs {
    order: 1;
    flex-grow: 1;
    text-align: right;
}

.userphoto {
    background-color: #fff;
    border-radius: 50%;
    background-image: url("//aupairireland.ie//svg/brand-jobseeker.svg");
    height: 120px;
    width: 120px;
    background-size: 85px;
    background-repeat: no-repeat;
    background-position: center;
    border: 1px solid #fff;
}
@media (max-width: 1500px) {
    span.cormen input[type="checkbox"]:not(:checked) + ul .useropts {
        display: flex;
        flex-wrap: wrap;
        padding-bottom: 0.5rem;
    }
    span.cormen input[type="checkbox"]:not(:checked) + ul .useropts span {
        padding: 0 0.5rem;
    }
    span.cormen input[type="checkbox"]:not(:checked) + ul span.details {
        order: 3;
        flex-grow: 1;
    }
    span.cormen input[type="checkbox"]:not(:checked) + ul span.photo {
        order: 1;
        width: 100%;
        display: flex;
        justify-content: center;
        margin-bottom: 0.5rem;
    }
    span.cormen input[type="checkbox"]:not(:checked) + ul span.cvs {
        order: 2;
        flex-grow: 1;
        text-align: right;
    }
}
@media (max-width: 1100px) {
    span.cormen input[type="checkbox"]:not(:checked) + ul span.cvs div,
    span.cormen input[type="checkbox"]:not(:checked) + ul span.details div {
        display: flex;
        justify-content: center;
        width: 100%;
    }
}
@media (max-width: 400px) {
    span.cormen input[type="checkbox"]:checked + ul .useropts {
        flex-wrap: wrap;
    }
    span.cormen input[type="checkbox"]:checked + ul span.photo {
        order: 1;
        width: 100%;
        display: flex;
        justify-content: center;
        margin-bottom: 0.5rem;
    }
    span.cormen input[type="checkbox"]:checked + ul span.details {
        order: 3;
        flex-grow: 1;
    }

    span.cormen input[type="checkbox"]:checked + ul span.cvs div,
    span.cormen input[type="checkbox"]:checked + ul span.details div {
        display: flex;
        justify-content: center;
        width: 100%;
    }
}
@media (max-width: 768px) {
    .cormen {
        display: flex;
        flex-direction: column-reverse;
        position: fixed;
        /*styling only below, used to position the hamburger, 'width' will change depending on the 'left' value*/
        bottom: 30px;
        left: 30px;
        width: calc(100% - 58px);
        /*add a max width if you don't want it spanning the page*/
        max-width: 300px;
    }
    .cormen label {
        display: inline-block;
        width: 60px;
        height: 60px;
        position: relative;
        text-indent: 999px;
        font-size: 0;
        color: transparent;
        overflow: hidden;
        border-radius: 50%;
        background-color: #fab81e;
        box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
    }
    .cormen label::before {
        content: url("//aupairireland.ie/svg/icon-hamburger-white.svg");
        display: inline-block;
        width: 60px;
        height: 60px;
        position: absolute;
        top: 0;
        left: 0;
        text-indent: 0;
        overflow: visible;
        font-size: 22px;
        text-align: center;
        border-radius: 50%;
        cursor: pointer;
    }

    .cormen ul {
        display: none;
        list-type: none;
        min-width: 100%;
        border-radius: 1rem;
    }
    span.cormen input[type="checkbox"]:checked + ul {
        display: block;
        animation-name: fadein;
        animation-duration: 350ms;
    }

    @keyframes fadein {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }
}
!

JS
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