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

.materia {
    width: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: left;
}

.cont-text {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: left;
    justify-content: center;
    text-align: left;
}

.box-text {
    margin: 10px;
    
}

.title,
.subtitle,
.heading {
    color: #333;
}

.heading,
p {
    margin: 0;
}

p {
    font-size: 1.3rem;
    margin-left: 10px;
    color: #555;
    margin: 20px 0;
}

.heading {
    font-size: 1.8rem;
    margin-bottom: 5px;
}

img {
    width: 60%;
    margin: 0 auto;
}

@media (max-width:800px) {
    .materia {
        width: 100%;
    }
}