I can´t understand why my webpage does not appears in the middle of the browser, I´ve tried several things and nothing.

body {
  font-family: Helvetica, Arial;
  font-size: 27px;
  margin: 0 auto;
  max-width: 960px;
  padding: 40px 10px;
  line-height: 1.65em;
  background: #C14242;
  color: #fff;
  font-weight: 300; 
}

.logo{
  width: 100%;
}

.logo img {
  margin: 0 auto;
  display: block;
  width:50%;
}

.description {
  margin: 80px auto 40px;
  text-align: center;
}

.bucket {
  width: 100%;
  margin-bottom: 40px;
  display: inline-block;
}

.choice-bucket {
  width: 33.333333%;
  float: left;
  display: inline-block;
  margin: 0;
  padding: 0;
}

.choice-bucket input {
    font-size: 18px;
    margin: 15px 4%;
    padding: 16px 0;
    width: 92%;
    color: #BB475C;
    border-radius: 6px;
    border: 0;
    outline: 0;
    text-indent: 20px;
}

.highlight {
  font-size: 18px;
  margin-left: 30px;
  opacity: .8;
  line-height: 24px;
}

#answers {
    /* opacity: 0; */
    margin: 60px 0;
    background: #fff;
    border-radius: 6px;
    color: #BB475C;
    transition: 1s linear;
    overflow: hidden; /* add this */
}

#answers p {
  max-width: 760px;
  margin: auto;
  padding: 80px 0;
}

#answers p span {
  font-weight: bold;
}

form input[type=submit] {
    background: #B5D269;
    border: 0;
    color: #fff;
    font-size: 20px;
    padding: 1em 2em;
    cursor: pointer;
    margin: 0 auto 60px;
    display: block;
    text-align: center;
    border-radius: 6px;
    font-weight: bold;
}

.hide {
  opacity: 0;
  height: 0;
}

.show {
  opacity: 1;
  height: 100%;
}