.calcula-media  {
    align-items: center;
    display: flex;
    flex-direction: column;
    width: 100%;
}


.disciplinas, .disciplina   {
    align-items: center;
    display: flex;
    flex-direction: column;
    margin: 5% 0;
}

.area-do-conhecimento    {
    padding: 5px 0;
    text-align: center;
}

.disciplina__p  {
    text-align: center;
    width: 50%;
}
 
.botao  {
    border: none;
    border-radius: 5px;
    height: 30px;
    width: 150px;
}
    
.media  {
    font-size: 25px;
}

span    {
    display: block;
    margin: 1%;
    text-align: center;
}
    
@media screen and (min-width: 922px) {
    .calcula-media  {
        margin-left: 50%;
        width: 50%;
    }
}