div {
    background: green;
}
.titulo {
    text-align: center;
}
.w-50 {
    width: 50%;
}
.c1 {
    display: flex;
}
.color_titulo {
    color: #032fa1;
    font-size: 3rem;
}
.w-33 {
    width: 33%;
}
.c2 {
    display: flex;
}
.cayuda {
    background: #d0d0d0;
    margin: 1rem;
    padding: 2rem;
    border-radius: 15px;
}
.ccartillas {
    margin: 1rem;
    background: yellow;
    padding: 1rem;
    border-radius: 10px;
    height: 5rem;
    transition: all 500ms;
}
.ccartillas:hover {
    background: red;
    transform: scale(1.1);
    cursor: pointer;
    transition: all 500ms;
}
#titulo-principal {
    font-style: italic;
}
h1 {
    font-weight: bold;
}
#backgr {
    background: orange;
}
#backgr:hover {
    background: red;
}
#sangria li {
    margin-top: 1rem;
    list-style: none;
}
#sangria {
    padding: 0;
}