.flex-center {
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1;
    width: 100%;
}

.outer-menu .checkbox-toggle {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 2;
    cursor: pointer;
    width: 60px;
    height: 60px;
    opacity: 0;
}

.outer-menu .checkbox-toggle:checked + .hamburger > div {
    -webkit-transform: rotate(135deg);
    transform: rotate(135deg);
}

.outer-menu .checkbox-toggle:checked + .hamburger > div:before,
.outer-menu .checkbox-toggle:checked + .hamburger > div:after {
    top: 0;
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
}

.outer-menu .checkbox-toggle:checked + .hamburger > div:after {
    opacity: 0;
}

.outer-menu .checkbox-toggle:checked ~ .menu {
    pointer-events: auto;
    visibility: visible;
}

.outer-menu .checkbox-toggle:checked ~ .menu > div {
    -webkit-transform: scale(1);
    transform: scale(1);
    -webkit-transition-duration: 0.75s;
    transition-duration: 0.75s;
}

.outer-menu .checkbox-toggle:checked ~ .menu > div > div {
    opacity: 1;
    -webkit-transition: opacity 0.4s ease 0.4s;
    transition: opacity 0.4s ease 0.4s;
}

.outer-menu .checkbox-toggle:hover + .hamburger {
    #box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.outer-menu .checkbox-toggle:checked:hover + .hamburger > div {
    -webkit-transform: rotate(225deg);
    transform: rotate(225deg);

}

.outer-menu .hamburger {
    position: absolute;
    top: 0;
    right: 40px;
    z-index: 1;
    width: 60px;
    height: 60px;
    #padding: 0.5em 1em;
    background: rgba(255, 255, 255, 0.75);
    border-radius: 0 0.12em 0.12em 0;
    cursor: pointer;
    cursor: hand;
    -webkit-transition: box-shadow 0.4s ease;
    transition: box-shadow 0.4s ease;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu .hamburger label {
    cursor: pointer;
    cursor: hand;
    padding-right: 12px;
}

.outer-menu .hamburger > div {
    position: relative;
    -webkit-box-flex: 0;
    flex: none;
    width: 100%;
    height: 2px;
    background: #000000;
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu .hamburger > div:before,
.outer-menu .hamburger > div:after {
    content: '';
    position: absolute;
    z-index: 1;
    top: -10px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #000000;
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
}

.outer-menu .hamburger > div:after {
    top: 10px;
}


.outer-menu .menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    visibility: hidden;
    overflow: hidden;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    outline: 1px solid transparent;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu .menu > div {
    width: 200vw;
    height: 200vw;
    background: rgba(255, 255, 255, 0.97);
    border-radius: 50%;
    -webkit-transition: all 0.4s ease;
    transition: all 0.4s ease;
    -webkit-box-flex: 0;
    flex: none;
    -webkit-transform: scale(0);
    transform: scale(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    overflow: hidden;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu .menu > div > div {
    text-align: center;
    max-width: 90vw;
    max-height: 100vh;
    opacity: 0;
    -webkit-transition: opacity 0.4s ease;
    transition: opacity 0.4s ease;
    overflow-y: auto;
    -webkit-box-flex: 0;
    flex: none;
    display: -webkit-box;
    display: flex;
    -webkit-box-align: center;
    align-items: center;
    -webkit-box-pack: center;
    justify-content: center;
}

.outer-menu .menu > div > div > ul {
    list-style: none;
    padding: 0 1em;
    margin: 0;
    display: block;
    max-height: 100vh;
}

.outer-menu .menu > div > div > ul > li {
    padding: 0;
    margin: 1em;
    font-size: 24px;
    display: block;
}

.outer-menu .menu > div > div > ul > li > a {
    position: relative;
    display: inline;
    cursor: pointer;
    -webkit-transition: color 0.4s ease;
    transition: color 0.4s ease;
    color: #000000;
}

.outer-menu .menu > div > div > ul > li > a:hover {
    color: #ee0011;
}

.outer-menu .menu > div > div > ul > li > a:hover:after {
    width: 100%;
}

.outer-menu .menu > div > div > ul > li > a:after {
    content: '';
    position: absolute;
    z-index: 1;
    bottom: -0.15em;
    left: 0;
    width: 0;
    height: 2px;
    background: #ee0011;
    -webkit-transition: width 0.4s ease;
    transition: width 0.4s ease;
}