index.css

*{
    margin: 0;
    padding: 0;
}
body{
    background:whitesmoke;
    font-family: 'Roboto', sans-serif; 
}

header{
    background-color: black;
    color: rgb(240, 229, 245);
    display: flex;
    justify-content:space-between;
    align-items: center;
    padding:25px;
}

a{
    text-decoration: none;
    color: whitesmoke;
}

.titulo{
    margin: 25px 25px;
    color: blueviolet;
}

nav{
    width:960px;
    margin: 0 auto;
    display: flex;
    justify-content:space-between;
}

.menu{
    margin: 35px;
    position:relative;
    color:rgb(232, 232, 213);
}

.select-lang{
    cursor: pointer;
    display:flex;
    justify-content: space-between;
    line-height: 2;
    width: 100px;
    
}

.select-lang:before {
        content: '';
        display: block;
        width: 32px;
        height: 32px;
        background-image: url(https://flagsapi.com/ES/flat/32.png);
}

.menu ul{
    border-radius: 6px;
    margin: 0;
    padding: 0;
    background-color: rgb(50, 50, 50);
    border: 2px solid rgb(50, 50, 50);
    position:absolute;
    display:none;
    
}

.menu:hover ul {
    display:block;
}

.menu ul li{
    list-style: none;
    display: flex;
    justify-content: space-between;
}

.menu ul li a{
    width:125px;
    display: block;
    padding: 5px 10px;

}

.menu ul li a:hover {
    background-color: rgb(14, 14, 14);
    border-radius: 5px;
}

.menu ul li a:before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    margin-right: 5px;
    width: 32px;
    height: 32px;
    
}

.es:before {
    background-image: url(https://flagsapi.com/ES/flat/32.png);
}

.en:before {
    background-image: url(https://flagsapi.com/GB/flat/32.png);
}

img {
    border-radius: 50%;
    border: 5px solid black;
    box-shadow: 4px 4px 10px black;
    width: 220px;
    height: auto;
}

img:hover{
    animation: pulse;
    animation-duration: 1.3s;
}

h1{font-size: 3em}
  
section {
    flex-direction: column;
    display: flex;
    margin: 40px auto;
    max-height: 10%;
    justify-content: center;
    align-items: center;
    font-size: 1.1rem;
}



#text {
    background-color: rgb(2, 2, 2);
    color: whitesmoke;
    padding: 50px 50px;
    min-width: 86%;
    border: 5px solid blueviolet;
    border-radius: 11px;
    font-size: 1rem;
}

button {
    font-size: 0.8rem;
    font-weight: bold;
    padding: 10px 30px;
    max-width: 170px;
    border-radius: 14px;
    border: 2px solid black;
    box-shadow: 2px 2px 10px rgb(97, 19, 171);
    color: rgb(255, 255, 255);
    background-color: blueviolet;
}

button:hover {
    background-color: rgb(110, 19, 195);
    animation: headShake;
    animation-duration: 1s;
}

footer{
    background-color: black;
    color: white;
    padding: 0%;
}