index.css

/***************/
/* DIAGRAMAÇÃO */
/***************/

body {
    display: grid;    
    grid-template-columns: 100%;
    grid-template-rows: auto auto auto auto auto auto;
    grid-template-areas:
        'cabecalho'
        'pesquisa'
        'proposito'
        'imoveis'
        'conteudo'
        'rodape';
}

nav {grid-area: navegacao;}
header {grid-area: cabecalho;}
section.pesquisa {grid-area: pesquisa;}
section.proposito {grid-area: proposito;}
section.imoveis {grid-area: imoveis;}
section.conteudo {grid-area: conteudo;}
footer {grid-area: rodape;}

/************/
/* PESQUISA */
/************/

.pesquisa {
    display: flex;
    flex-direction: column;
    justify-content: center;
    background-image: url("apartamento.png");
    background-position: bottom;
    background-attachment: fixed;
    background-size: cover;
}

.pesquisa .form-pesquisa {
    margin: 150px auto;
    min-width: 70%;
    border-radius: 5px;
    background-color: rgba(255,255,255,.95);
}

.pesquisa .input {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.pesquisa .input div,
.pesquisa #mais-filtros fieldset,
.pesquisa .submit div {
    padding: 20px 30px;
}

.pesquisa #mais-filtros {
    display: none;
    flex-direction: row;
    justify-content: space-around;
}

.filtros #mais-filtros  {
    display: none;
    flex-direction: column;
    justify-content: space-around;
}

.pesquisa .submit {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.pesquisa #mais-filtros input[type=text],
.pesquisa #mais-filtros input[type=number],
.pesquisa #mais-filtros select {
    width: 80px;
}

@media(max-width: 768px) {

    .pesquisa .form-pesquisa {
        margin: 0 auto;
        width: 98%;
    }

    .pesquisa #mais-filtros {
        flex-direction: column;
        text-align: center;
    }

    .pesquisa .input div,
    .pesquisa #mais-filtros fieldset,
    .pesquisa .submit div {
        padding: 20px 5px;
    }

    .pesquisa .input {
        flex-direction: column;
        align-items: center;
        margin: 15px 0 0 0
    }
}

/*************/
/* PROPÓSITO */
/*************/

.proposito {
    padding: 30px 0;
    background-color: rgb(0,158,170);
}

.proposito div {
    margin: 30px auto;
    width: 80%;
    color: #fff;
    text-align: center;
    font-size: 1.2em;
}

blockquote {
    font-style: italic;
}

.proposito div img {
    margin: 0 5px;
    width: 14%;
    height: auto;
}