body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(to bottom, rgba(44, 83, 100, 0.9), rgba(32, 58, 67, 0.9), rgba(15, 32, 39, 0.9));
    margin: 0;
    height: 100vh;
    width: 100vw;
    box-sizing: border-box;
    background-size: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

header {
    height: 7%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#titre {
    text-decoration: underline;
}

#container {
    width: 100vw;
    height: 86%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#exercices {
    width: 60%;

    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
}

.exercice {
    height: 50px;
    width: 150px;
    background-color: #a3a5ac;
    border-radius: 15px;
    margin: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: black;
    text-decoration: none;
    transition: 0.5s;
}

.exercice:hover {
    transform: scale(1.1);
    background-color: #6f6f78;
    transition: 0.5s;
}

footer {
    height: 7%;
    width: 90%;
    display: flex;
    bottom: 0;
    color: white;
    border-top: 1px solid white;
    position: fixed;
    justify-content: space-between;
}