body {
    background-color: #ccd7ff;
    position: relative;
    z-index: 5;

}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

a {
    transition: all .4s ease-in;
}

a, a:hover {
    text-decoration: none;
}

header {
    background-color: #fff;
    padding: 10px;
    position: relative;
    z-index: 20;
}

header .side-nav-toggler, header .side-nav-toggler-close {
    width: 30px;
    height: 20px;
    position: relative;
    cursor: pointer;
    margin: 0;
    vertical-align: sub;
    box-shadow: inset 0 1px 0 #000, inset 0 -1px 0 #000;
}

header .side-nav-toggler-close {
    box-shadow: none;
    vertical-align: unset;
    margin: 0 0 8px 10px;
}

header .side-nav-toggler:before,
header .side-nav-toggler-close:before,
header .side-nav-toggler-close:after {
    content: '';
    position: absolute;
    background-color: #000;
    height: 1px;
    width: 100%;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
}

header .side-nav-toggler-close:before {
    transform: rotate(45deg);
}

header .side-nav-toggler-close:after {
    transform: rotate(-45deg);
}

header .logo {
    text-align: right;
}

header #side-nav {
    display: none;
}

header #side-nav:checked+nav {
    left: 0;
}

header #side-nav+nav {
    position: fixed;
    left: -300px;
    top: 0;
    background-color: #fff;
    min-width: max-content;
    height: 100vh;
    z-index: 10;
    padding-top: 10px;
    transition: all .4s ease-out;
}

header nav ul li {
    padding: 5px 15px;
    padding-top: 20px;
}

aside.side-links {
    width: max-content;
    background-color: #fff;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 10;
}

aside ul {
    flex-direction: column;
    height: inherit;
    justify-content: space-evenly;
}

aside ul li {
    transform: rotate(180deg);
    writing-mode: vertical-lr;
    padding: 0 10px;
}

aside ul li a {
    color: #000;
}

footer {
    position: fixed;
    background: #fff;
    z-index: 20;
    bottom: 0;
    left: 0;
    padding: 10px 0;
}