body {
  background-image: linear-gradient(90deg, #FFF, #f5f5f5);
}

#boas-vindas {
  overflow: hidden;
  background-image: url("../img/bg-topo.svg");
  background-position: right center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: auto 340px;
}
#boas-vindas img {
  margin: auto 0;
}
@media only screen and (max-width: 600px) {
  #boas-vindas {
    background-position: -3000px center;
  }
  #boas-vindas img {
    border-style: solid;
    border-color: #ccc;
    border-radius: 50%;
    width: 50%;
  }
}
@media only screen and (max-width: 1000px) {
  #boas-vindas {
    background-position: right bottom;
    background-size: auto 300px;
  }
}