style.css

* {
    padding:0;
    margin:0;
    vertical-align:baseline;
    list-style:none;
    border:0;
    text-decoration: none;
    font-family: 'Open Sans', sans-serif;
}

/* MOBILE */
@media(max-width: 992px) {
    .flex-container {
        flex-direction: column;
    }
    .apresent {
        flex-direction: column;
        text-align: center;
    }
    .apresent .text-apresent {
       width: 100%;
       margin: auto;
       align-items: center;
    }
    .text-apresent p {
        margin-bottom: 10px;
    }
    .text-apresent a {
        margin: auto;
    }
    #img-apresent{
        display:none;
    }
   
    #quem-somos {
        flex-direction: column-reverse;
        margin-top: 100px;
    }
    #quem-somos img {
        min-width: 320px;
        margin: auto;
    }
    .list-serv {
        flex-direction: column;
    }

    .item-serv img {
        max-width: 30%;
        width: 100%;
        margin: auto;
    }

    .list-planos {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 20px;
    }

    .list-planos .item-plan {
        max-width: 90%;
        margin: auto;
        width: 100%;
        margin-bottom: 20px;

    }
}

/* DESKTOP */
.flex-container {
    display: flex;
    max-width: 992px;
    margin: auto;
    width: 100%;
    min-width: 320px;
}
.btn{
    background-color: #F28249;
    color: #27428A;
    text-align: center;
    width: 220px;
    height: 50px;
    margin-top: 20px;
    border-radius: 35px;
    display: block;
    line-height: 50px;
}
div img {
    display: block;
    width: 100%;
}

header{
    background-color: #F28249;
    color: #fff;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    
}

header a {
    color: #5E7FDC;
}

header .list-items {
    display: flex;
    max-width: 260px;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    
}

header .menu {
    justify-content: space-between;
    
}

header .list-items li a {
    color: #fff;
}
header .list-items li a:hover {
    color: #5E7FDC;
}

.apresent {
    height: 100vh;
    align-items: center;
    justify-content: space-between;

}

        
.apresent .text-apresent {
    min-height: 200px;
    width: 100%;
}

.text-apresent h1{
    color:#27428A;
    font-size: 50px;
    margin-bottom: 15px;
}


#quem-somos {
    align-items: center;
    justify-content: space-between;
}

#quem-somos h2 {
    font-size: 32px;
    color: #27428A;
    display: flex;
    margin-bottom: 20px;
}

#quem-somos h2::before {
    content: "";
    height: 50px;
    width: 5px;
    margin-right: 10px;
    position: relative;
    background-color:  #F28249;
}

#quem-somos img{
    min-width: 420px;
}

.cont-extern{
    background-color: #F28249;
    width: 100%;
}
#serv {
    flex-direction: column;
    padding-top: 20px;
}
#serv h2 {
    color: #fff;
    font-size: 32px;
    margin-bottom: 35px;
}
.list-serv {
    display: flex;
    justify-content: space-between;
}
.list-serv .item-serv {
    text-align: center;
}
/* Fazer calculo para manter proporção 
#serv-im3 { 
    width: 200px;
    height: 160px;
}
*/
.item-serv a {
    width: 220px;
    background-color: #27428A;
    color: #fff;
    border-radius: 35px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    padding: 5px 10px;
    margin-top: 20px;
    font-size: 14px;
    font-weight: 700;
}

.item-serv p {
    font-weight: 700;
    font-size: 18px;
    color: #fff;
    margin-top: 20px;
    text-align: center;
}

.item-serv img {
    width: 80%;
    margin: auto;
}

#plan {
    flex-direction: column;
    min-height: 100vh;
    padding-top: 50px;

}
#plan h2 {
    color: #27428A;
    font-size: 32px;
    margin-bottom: 20px;
}

.list-planos {

    display:flex;
    align-items: flex-end;
    justify-content: space-between;
}

.item-plan {
    flex: 1;
    border: 5px solid #27428A;
    margin-right: 20px;
    padding: 15px;
    max-width: 240px;
}

.item-plan .btn {
    margin: auto;
    margin-bottom: 20px;
}

.item-plan h3 {
    font-size: 24px;
    display: flex;
    flex-direction: column;
    text-align: center;
    color: #27428A;

}

.item-plan h3::after {
    content: " ";
    background-color: #27428A;
    width: 100%;
    height: 2px;
    margin-top: 20px;
    margin-bottom: 10px;
}

.item-plan ul {
    padding: 10px 20px;
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

.item-plan ul li {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
}
.item-plan ul li::before {
    content: "";
    width: 10px;
    height: 10px;
    background-color: #F28249;
    margin-right: 10px;
}

footer {
    background-color: #F28249;
    height: 70px;
    display: flex;
    align-items: center;
}

.footer {
    justify-content: space-between;
    color: #27428A;
}