html, body {
    margin: 0;
    padding: 0;
    overflow-x: hidden; /* elimina scroll horizontal */
    overflow-y: hidden; /* elimina scroll vertical */
}

body {
    background-image: url('../IMG/fonde.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Logos */
#dv {
    position: absolute;
    top: 10px;
    left: 20px;
    width: 75px;
    z-index: 1;
}

#sena {
    position: absolute;
    top: 10px;
    right: 20px;
    width: 75px;
    z-index: 1;
}

/* Título */
.ds {
    color: #000;
    font-size: 90px;
    font-weight: 500;
    text-align: center;
    position: absolute;
    top: 66px;
    left: 50%;
    transform: translateX(-50%);
    margin: 0;
    line-height: 100px;
    transition: transform 0.2s, background-color 0.3s;
}

.cont {
        text-align: center;
        background: #fff;
        padding: 30px;
        border-radius: 20px;
        box-shadow: 0 6px 15px rgba(0,0,0,0.15);
        width: 320px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        }

.btn {
    display: block;
    width: 92%;
    padding: 12px;
    margin: 10px 0;
    font-size: 150%;
    font-weight: bold;
    text-decoration: none;
    color: rgb(0, 0, 0);
    background: #3d91f1;
    border-radius: 10px;
    transition: 0.3s;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn:hover {
    background: #2d81e0;
}