* {
    margin: 0;
    padding: 0;
    cursor: default;
}
nav {
    background-color: red;
    border-top: 2px black solid;
    
    padding: 5px 15px;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1;
}
img {
    width: 40px;
}

.menu {
    border: 1px limegreen solid;
    border-bottom: 0;
    width: 250px;
    position: fixed;
    bottom: 52;
    left: 40px;
}
.menu button {
    border: 0;
    width: 100%;
}
.menu button:not(:last-child) {
    border-bottom: 2px red solid;
}