.navbar-toggler{
    width: 20px;
    height: 20px;
    position: relative;
    transition: .5s ease-in-out;
}

/* Clearing bootstrap toggler icon */
.navbar-toggler, .navbar-toggler:focus, 
.navbar-toggler:active, .navbar-toggler-icon:focus{
    outline: none;
    box-shadow: none;
    border: 0;
}

.navbar-toggler span{
    margin: 0;
    padding: 0;
}

.toggler-icon{
    display: block;
    position: absolute;
    height: 3px;
    width: 100%;
    background-color: var(--primary);
    border-radius: 2px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: .25s ease-in-out;
}

.middle-bar{
    margin-top: 0;
}

/* transform hamburger icon into an X */

.navbar-toggler .top-bar{
    margin-top: 0;
    transform: rotate(135deg);
}

.navbar-toggler .middle-bar{
    opacity: 0;
    filter: alpha(opacity=0);
}

.navbar-toggler .bottom-bar{
    margin-top: 0;
    transform: rotate(-135deg);
}

/* make the hamburger menu */

.navbar-toggler.collapsed .top-bar{
    margin-top: -20px;
    transform: rotate(0deg);
}

.navbar-toggler.collapsed .middle-bar{
    opacity: 1;
    filter: alpha(opacity=1);
}

.navbar-toggler.collapsed .bottom-bar{
    margin-top: 20px;
    transform: rotate(0deg);
}