.menu-button {
    background-color: purple;  
    display: inline-block;
    width: 2.5em;
    height: 2.5em;
    line-height: 2.5em;
    text-align: center;
    font-size: 1rem;
    position: relative;
    display: inline-block;
}

div.menu-button > span {
    color:white;
}

.menu {
    max-height: 100vh;
    //transition: max-height 0.2s;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0,0,0,.3);
    position: absolute;
    top: 3rem;
    right:0;
}

.card {      
    padding:0.5rem;
    min-width: 10rem;          
}

.username {
    white-space: nowrap;
    font-weight: 500;
    font-size: 1.2rem;
    line-height: 1.2rem;
}

.card-body {
    text-align: left;
}

.hidden {
    max-height: 0;   
}

.menu-button.hidden {
    overflow: hidden;
}