detalhes.css

#container {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.detalhes {    
    width: 920px;
    box-sizing: border-box;
    background-color: #FFF8E2;
    background-image: url(img/fundo_bala.svg);
    background-repeat: no-repeat;
    background-size: cover;
    border: 8px solid #fff;
    border-radius: 30px;
    margin-top: 32px;
}
.linha-rosa {
    border: none;
    height: 2px;
    background-color: #DF2F4F;
}
.seta {
    display: inline-block;
    position: relative;
    border-right: 2px solid; 
    border-bottom: 2px solid;
    height: 8px;
    width: 8px;
    transform: rotate(135deg);
    z-index: -1;
}
#voltar {
    display: block;
    width: 920px;
}
#voltar a {
    font-weight: 500;
    font-size: 14;
}
#detalhes-img {
    width: 904px;
    height: 350px;
    background-size: cover;
    background-position-y: -110px;
    background-repeat: no-repeat;
    border-radius: 24px 24px 0 0;
}
#descricao {
    background-color: #fff;
    border: 1px solid #C8C8C8;
    width: 840px;
    border-radius: 24px;
    margin: 40px;
    line-height: 24px;
    padding-top: 24px;
    padding-bottom: 24px;
}
#descricao h3, #descricao h4, #descricao p, #adicionar{
    margin: 0 24px;   
}
#descricao h3 {
    color: #DF2F4F;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}
#adicionar {
    display: flex;
    justify-content: right;
    align-items: flex-end;
    margin-top: 28px;
}
#adicionar span {
    font-weight: 700;
    font-size: 16px;
    color: #525252;
}
#adicionar>input {
    margin: 0 16px;
    border-radius: 5px; 
    padding: 3px;   
    text-align: center;
    height: 14px;
    width: 40px;
    font-size: 14px;
}
#adicionar>button {
    color: #fff;
    border: none;
    padding: 4px 24px;
    background-color: #00B6F9;
    border-radius: 24px;
    font-weight: 700;
    line-height: 24px;
    font-size: 14px;
}