*{
    margin: 0;
    padding: 0;
}

:root{
    --background: #303030;
    --backbackground: black;
    --menu: #202020;
    --link: rgb(0,191,0);
    --visited: rgb(191,0,0);
    --hover: #404040;
    --click: #505050;
    --table: #505050;
    /* COLOR */
    --black: rgb(0,0,0);
    --white: rgb(255,255,255);
    --yellow: rgb(255,255,0);
    --red: rgb(255,0,0);
    --orange: rgb(255,127,0);
    --green: rgb(0,255,0);
    --blue: rgb(0,0,255);
}

a:link{
    color: var(--link);
}

a:visited{
    color: var(--visited);
}

a:visited{
    color: var(--visited);
}

html, body{
    height: 100vh;
    margin-left: auto;
    margin-right: auto;
    background-color: var(--backbackground);
    color: white;
    font-family: Courier, monospace;
    overflow-y: hidden;
}

body{
    height: 100vh;
    max-width: 1080px;
    display: flex;
    flex-direction: column;
    background-color: var(--background);
}

/* LOGO */

.logo{
    height: 50px;
}

.logo img{
    height: 40px;
    padding: 5px;
}

#github, #wca{
    height: 30px;
    padding: 10px;
}

/* HEADER */

header{
    background-color: var(--menu);
    display: flex;
    /*justify-content: space-between;
    max-width: 100%;*/
}

header nav{
    width: 980px;
    margin-right: 50px;
}

ul.menu, .menu ul{
    margin: 0;
    padding: 0;
    list-style-type: none;
    height: 50px;
    text-align: center;
}

.menu li{
    width: 100px;
    position: relative;
    display: inline-block;
}

.menu li a{
    display: block;
    width: 100px;
    line-height: 50px;
    text-align: center;
    color: white;
    text-decoration: none;
    background-color: var(--menu);
}

.menu li a:hover{
    background-color: var(--hover);
}

.menu li a:active{
    background-color: var(--click);
}

.menu li ul{
    display: none;
    position: absolute;
    left: 0;
    top: 50px;
}

.menu li:hover ul{
    display: block;
}

.menu li ul a{
    background-color: var(--menu);
}

/* MAIN */

main{
    height: 100vh;
    overflow-y: auto;
    padding: 2em;
}

/* FOOTER */

footer{
    /*height: 50px;*/
    background-color: var(--menu);
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* TABLE */

table{
    margin: 2em;
    background-color: var(--table);
}

table, th, td{
    margin-left: auto;
    margin-right: auto;
    padding: .5em;
    border: 2px solid black;
    border-collapse: collapse;
    text-align: center;
}

table img{
    padding: 0.3em;
    width: 96px;
}

/* CARD */

.card{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    padding: 2em 0;
}

.card a{
    border: 2px solid black;
    border-radius: 5px;
    padding: 1.5em;
    margin: 1em;
    text-decoration: none;
    color: white;
    text-align: center;
    background-color: var(--menu);
    /*flex-basis: 15%;*/
}

.card a:hover{
    background-color: var(--hover);
}

.card a:active{
    background-color: var(--click);
}

h1{
    text-align: center;
    padding: 1em 0;
}

h2{
    text-align: center;
    padding: 1em 0 0.5em 0;
}

h3{
    padding: 1em 0 0 0;
}

p{
    padding: 0.5em 0;
}

.importantAlg{
    text-align: center;
}

hr{
    border: 2px solid var(--menu);
    margin: 1em 0;
}

.alg{
    float: right;
}

.notation, .step{
    display: flex;
    flex-wrap: wrap;
    /*justify-content: center;*/
    align-items: center;
    text-align: center;
    padding: 0.5em 0;
}

.notation img, .step .cube img{
    width: 96px;
}

.step, .notation{
    background-color: var(--table);
    width: fit-content;
    padding: 1em;
    border: 2px solid black;
    border-radius: 5px;
    margin: 1em 0;
}

.step div, .notation div{
    padding: 0.5em;
}

/* FACE COLOR */

#U{
    color: var(--white);
}

#D{
    color: var(--yellow);
}

#R{
    color: var(--red);
}

#L{
    color: var(--orange);
}

#F{
    color: var(--green);
}

#B{
    color: var(--blue);
}

ol{
    padding: 0.5em 2em;
}

ul{
    padding: 0.5em 1em;
}