:root{
/* Tema: Verde */
    --verde-cor-botao: #408a71;
    --verde-gradiente-fundo: 
    linear-gradient(to top, hsl(175, 10%, 6%), hsl(175, 38%, 6%));
/* Tema: Roxo */
    --roxo-cor-botao: #9139a8;
    --roxo-gradiente-fundo: 
    linear-gradient(to top, hsl(280, 15%, 6%), hsl(280, 45%, 7%));
/* Tema: Vermelho */
    --vermelho-cor-botao: #b32d2d;
    --vermelho-gradiente-fundo: 
    linear-gradient(to top, hsl(0, 25%, 7%), hsl(0, 50%, 8%));
/* Tema: Azul  */
    --azul-cor-botao: #3d7eb5;
    --azul-gradiente-fundo: 
    linear-gradient(to top, hsl(210, 15%, 6%), hsl(210, 40%, 7%));
/* Tema: Laranja  */
    --laranja-cor-botao: #c76b2c;
    --laranja-gradiente-fundo: 
    linear-gradient(to top, hsl(25, 15%, 6%), hsl(25, 45%, 7%));
/* Tema:  Liquid Glass (spoiler p quem tiver vendo o código) 
    --cor-botao: #408a71;
    --gradiente-fundo: 
    linear-gradient(to top, hsl(175, 10%, 6%), hsl(175, 38%, 6%));
    (spoiler p quem tiver vendo o código) */
}

body{
    color: whitesmoke;
    font: bold 1.5em "Arial", sans-serif;
    
    background-image: var(--verde-gradiente-fundo);

    height: 100vh;
    margin: 0;
    background-repeat: no-repeat;
    background-attachment: fixed;

    display: flex;
    flex-direction: column;

    justify-content: space-between; 
    align-items: center;
    padding: 20px 0; 
    box-sizing: border-box;
}

header > h1{
    margin: 0;
}
.titulo{
    color: #285A48;
}

main{
    flex-grow: 0.5; /* n sei se é o melhor jeito, mas tá funcionando */
}

.cronometro{
    text-align: center;
    font-size: 4em;
}

#div-buttons{
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10%;
    margin-top: 15px;
}
.buttons{
    background-color: transparent;
    font-size: 1em;
    border: 2px solid var(--verde-cor-botao);
    border-radius: 15px ;
    color: whitesmoke;
    padding: 5px 10px 5px 10px;

    min-width: 150px;
    height: 70px;
}
.buttons:hover{
    transition: transform 0.5s ease;
    background-color: var(--verde-cor-botao);
    transform: scale(1.075);
}