:root {
    --background: #dfdfdf;
    --dark-background: #b7b7b7;
    --light-background: #e8e8e8;
    --blue: #699ee8;
    --yellow: #fcda74;
    --red: #f97171;
    --green: #2ecc71;
    --black: #272727;
    --bright-blue: #3287ff;
}

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

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

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

body {
    background-color: var(--background);
    display: block;
    align-content: center;
    justify-content: center;
    font-family: "Ubuntu", sans-serif;
}

nav {
    width: 100%;
    height: 20%;
}

nav ul {
    width: 100%;
    height: 100%;
    padding: 0;
    list-style-type: none;
    display: flex;
    justify-content: space-between;
}

nav ul li {
    display: inline;
}

nav ul li h1 {
    font-size: 72px;
    font-weight: 700;
    margin: 15px;
    text-shadow: 5px 5px var(--dark-background);
}

nav ul li #back {
    width: 40px;
    height: 40px;
    margin: 15px;
}

nav ul li #menu {
    width: 50px;
    height: 50px;
    margin: 15px;
}

main {
    background-color: var(--background);
    width: auto;
    margin-left: 15%;
    margin-right: 15%;
    border-radius: 5px;
    border: solid var(--dark-background);
    box-shadow: 5px 10px var(--dark-background);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;

}

#mainDiv {
    width: 100%;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    height: 33%;
}

.mainColors {
    float: left;
    width: 200px;
    height: 200px;
    background-color: #000000;
    margin: 15px;
    text-align: center;
    border-radius: 20px;
    border: solid var(--dark-background);

}

.mainColors h2 {
    margin: 10px;
    background-color: var(--background);
    border: solid var(--dark-background);
    border-radius: 20px;
    color: var(--black);
}

form {
    font-size: larger;
    width: 100%;
    height: 50px;
    margin: 0;
    padding: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

form input {
    height: 36px;
}

#text {
    width: 108px;
    padding-inline: 16px;
    font-size: large;
    text-transform: uppercase;
}

#submit {
    background-color: var(--bright-blue);
    border-radius: 20px;
    border: solid var(--dark-background);
    box-shadow: 5px 5px var(--dark-background);
    color: var(--background);
}

#submit:hover {
    background-color: var(--bright-blue);
    border-radius: 20px;
    border: solid var(--light-background);
    box-shadow: 5px 7px var(--dark-background);
    color: var(--black);
}

#previous {
    width: 100%;
    text-align: center;
    padding: 20px;
    max-width: 600px;
    margin: 0 auto;

}

#previous h2 {
    margin: 10px;
    padding: 10px;
    background-color: var(--background);
    border: solid var(--dark-background);
    border-radius: 20px;
    color: var(--black);
    text-align: center;
    margin-bottom: 20px;
}

#previous ul {
    list-style-type: none;
    padding: 15px;
    margin: 10px 0;
    border-radius: 8px;
    border: solid var(--dark-background);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

#previous ul li {
    padding: 10px;
    border-radius: 5px;
    color: var(--light-background);
    display: inline-block;
    width: 40px;
    height: 40px;
    margin: 5px;
    text-align: center;
    line-height: 40px;
    border: solid var(--dark-background);
    font-size: 24px;
    font-weight: bold;
    background-color: var(--light-background);
    text-transform: uppercase;
}

.correct {
    background-color: var(--green) !important;
}

.close {
    background-color: var(--yellow) !important;
}

.incorrect {
    background-color: var(--red) !important;
}

.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    background-color: var(--background);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.popup-content button {
    background-color: var(--bright-blue);
    color: var(--background);
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 15px;
    font-size: 16px;
}

.popup-content button:hover {
    background-color: var(--blue);
}