* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    width: 100vw;
    height: 100vh;
    background-image: url('../img/MEESI.webp');
    background-size: cover;
}

header {
    width: 100%;
    height: 80px;
    background-color: black;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

ul {
    display: flex;
    gap: 15px;
    list-style: none;
}

a {
    text-decoration: none;
    font-size: x-large;
    font-family: Arial, Helvetica, sans-serif;
    color: black;
    padding: 8px;
    background-color: white;
    border: 5px
}

.actividades{
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    max-width: 900px;
    margin: 20px auto;
    background-color: black;
    gap: 20px;
}

.logo-izquierda {
    width: 100px;
}

h3{
    color:black;
}

.ejercicio {
    border: 5px solid black;
    padding: 15px;
    text-align: left;
    color: black;
    background-color: white;
    opacity: 0.8;
}

button.ejecutar {
    margin-top: 15px;
    padding: 10px 20px;
    font-size: medium;
    background-color: darkblue;
    color: white;
    border: none;
}