html {
  font-family: sans-serif;
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  padding: 0;
  font-family: Roboto, sans-serif;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.5px;
  text-align: left;
}
#begin {
  width: 100% !important;
}
.center-box {
  background-color: #c8c8c8;
  text-align: center;
  position: absolute;
  width: 300px;
  height: 400px;
  margin: -150px 0 0 -150px;
  left: 50%;
  top: 50%;
}
.button {
  width: 150px;
  height: 150px;
  margin: 15px auto 0;
  border: 2px solid #666;
  color: #000;
  -moz-border-radius: 15px;
  -webkit-border-radius: 15px;
  border-radius: 15px;
  font-size: 4rem !important;
}
.button .text {
  font-size: 24px;
  padding: 0 10px;
}
.op {
  width: 200px;
  height: auto;
  margin: 0 auto;
  color: #000;
  padding: 30px 0;
}

a{
  color: #000;
  text-decoration: none;
}