styles.css

:root {
    --dark-blue: hsl(220, 100%, 11%);
    --pastel-purple: hsl(277, 41%, 66%);
    --pastel-pink: hsl(11, 100%, 90%);
    --pastel-light-blue: hsl(165, 26%, 69%);
    --pastel-light-green: hsl(76, 58%, 76%);
    --light-grey: hsl(76, 13%, 83%);
    --white: hsl(0, 0%, 100%);
}

html {
    font-size: 100%;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

*,
*::after,
*::before {
    -webkit-box-sizing: inherit;
    box-sizing: inherit;
}

body {
    font-family: 'Roboto Mono', monospace;
    font-weight: 300;
    line-height: 1.3;
    margin: 0;
    padding: 2rem 2rem 0 2rem;
    background-color: var(--light-grey);
    color: var(--dark-blue);
}

.header {
    display: flex;
    justify-content: space-between;
}

.fa-sun,
.fa-moon {
    font-size: 2rem;
}

.fa-folder-open {
    font-size: 1.5rem;
    color: var(--pastel-purple);
}

.fa-folder-open:hover {
    color: var(--pastel-pink);
}

h1,
h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 500;
}

.menu.active {
    display: block;
    background-color: var(--light-grey);
    border-radius: 0.6rem;
    padding: 2rem;
    margin-top: 2rem;
}

.menu {
    display: none;
}

.menu ul {
    display: flex;
    gap: 0.25rem;
    flex-direction: column;
    text-decoration: none;
    font-size: 1.5rem;
    text-align: center;
}

.menu a {
    padding: 0.2rem;
    text-decoration: none;
    color: var(--dark-blue);
}

.menu a:hover {
    color: var(--pastel-purple);
}

.txt-description {
    text-align: center;
}

#about {
    align-items: center;
}

.txt-about {
    background-color: var(--light-grey);
    color: var(--dark-blue);
    width: 17.75rem;
    height: 12.5rem;
    border-radius: 0.6rem;
    margin-left: auto;
    margin-right: auto;
    padding: 0.5rem;
}

.banderas {
    margin-top: 2rem;
    text-align: center;
    font-size: 2rem;
}


/*.circle-blue {
    position: absolute;
    bottom: 16.8rem;
    left: 2.6rem;
    width: 1.5rem;
    height: 1.5rem;
    background-color: var(--pastel-light-blue);
    border-radius: 5rem;
    padding: 0.5rem;
}
.circle-purple {
    width: 1.5rem;
    height: 1.5rem;
    background-color: var(--pastel-purple);
    border-radius: 5rem;
    position: absolute;
    left: 2.6rem;
    bottom: -2.6rem;
}

*/

.txt-skills {
    display: flex;
    background-color: var(--light-grey);
    color: var(--dark-blue);
    width: 17.75rem;
    height: 12.5rem;
    border-radius: 0.6rem;
    margin-left: auto;
    margin-right: auto;
}

.txt-skills ul {
    justify-content: space-around;
    flex-direction: column;
    margin-left: 0.30rem;
}

.projects div {
    margin-right: auto;
    margin-left: auto;
    margin-bottom: 2.5rem;
    width: 15rem;
    height: 20rem;
    border-radius: 0.8rem;
    color: var(--dark-blue);
    text-align: center;
}

.projects :nth-child(1) {
    background-color: var(--pastel-purple);
}

.projects :nth-child(2) {
    background-color: var(--pastel-light-blue);
}

.projects :nth-child(3) {
    background-color: var(--pastel-light-green);
}

form {
    margin-right: auto;
    margin-left: auto;
}

input {
    width: 12rem;
    border-radius: 0.2rem;
    margin-bottom: 0.6rem;
}

#mensaje {
    width: 15rem;
    height: 10rem;
    border-radius: 0.2rem;
    margin-bottom: 0.6rem;
}

#sumit {
    cursor: pointer;
    border-style: none;
    background-color: var(--pastel-purple);
    padding: 0.5rem;
    width: 6rem;
    margin-bottom: 2rem;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

li {
    display: inline;
    margin-right: 0.5rem;
}

.fab {
    font-size: 2rem;
    color: var(--pastel-light-blue);
}

.fab:hover {
    color: var(--pastel-pink);
}

.footer {
    margin-top: 2rem;
    text-align: center;
}

#arrow-up {
    display: none;
    position: fixed;
    right: 1rem;
    bottom: 10%;
    background-color: var(--pastel-pink);
    opacity: 0.8;
    padding: 0.3rem;
    border-radius: 1rem;
    color: var(--dark-blue);
    z-index: 10;
    transition: 0.4s;
}

#arrow-up:hover {
    background-color: var(--pastel-light-green);
}

#arrow-up i {
    font-size: 1.25rem;
}

body.dark-theme {
    background-color: var(--dark-blue);
    color: var(--light-grey)
}