style.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@100&display=swap');

:root{
    --font-family: "Montserrat", sans-serif;
    --bg-color: #3C5B6F;
    --primary-color: #F1F1F1;
}

body{
    background-color: var(--bg-color);
    color: var(--primary-color);
    min-height: 100vh;
    font-family: var(--font-family);
}

.lang{
    display: flex;
    justify-content: flex-end;
}

.lang,button{
    margin: 0 10px 0 10px;
}



section{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 100vh;
    margin : 0;
}

h1{
    font-size: 5em;
}

h3{
    font-size: 2em;
    margin-top: 20px;
}

.message{
    font-size: 1.5em;
    margin: 40px;
}

.box{
    border: 2px solid var(--primary-color);
    display: inline-block;
    min-width: 1em;
    min-height: 1em;
    border-radius: 10px;
    padding: 10px;
    margin: 20px;
    font-size: 4em;
}

button{
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    font-family: var(--font-family);
    background-color: transparent;
    border-radius: 0.4em;
    padding: 1em;
    margin-top: 1.5em;
}

button:hover{
    transition: 10ms;
    background-color: #2b4150;
    cursor: pointer;
}

.active{
    background-color :#2b4150;
    color: #dfdddd;
}