* { box-sizing: border-box; }

body { margin: 0; 
  background-color: WhiteSmoke;
  font-size: 100%;
}

.header {
  margin: auto;
  padding: 5px;
  width: 100%;
  min-width: 500px;
  background-color: #E5E5E5;
  border: 6px;
  border-style: solid;
  border-color: WhiteSmoke ;
  color: white;
  font: normal small-caps 22px "Times New Roman", Times, serif;
  text-shadow: 2px 2px 5px Black;
  text-align: center;
  z-index: 1;
}

.center {
  margin: auto;
  padding: 10%;
  width: 80%;
  background-color: #E5E5E5;
  border: 6px;
  border-style: solid;
  border-color: WhiteSmoke ;
  color: black;
  font: normal small-caps 16px "Verdana", Tahoma, sans-serif;
  text-align: left;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
}

.center2 {
  margin: auto;
  padding: 10%;
  width: 80%;
  background-color: #E5E5E5;
  border: 6px;
  border-style: solid;
  border-color: WhiteSmoke ;
  color: black;
  font: normal small-caps 16px "Verdana", Tahoma, sans-serif;
  text-align: left;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
}

.abajo {
  margin: auto ;
  padding: 0px 10px;
  width: 100%;
  background: #E5E5E5;
  color: black;
  border: 6px;
  border-style: solid;
  border-color: WhiteSmoke ;
  font: normal 16px "Times New Roman", Times, serif;
  text-align: center;
  position: fixed;
  bottom: 0;
  z-index: -1;
}

.leftup {
  position: absolute;
  text-align: left;
  padding: 0px 12px;
  font: normal 18px "Times New Roman", Times, serif;
  color: black;
  text-shadow: 0px 0px 0px Black;
  width: 400px;
}

.rightup {
  position: absolute;
  text-align: right;
  padding: 0px 20px;
  font: normal 17px "Times New Roman", Times, serif;
  color: black;
  text-shadow: 0px 0px 0px Black;
  top: 8px;
  right: 0px;
  width: 340px;
}

.rightbottom {
  position: absolute;
  bottom: 4px;
  right: 10px;
  width: 100px;
  text-align: center;
  padding: 0px 0px 0px 0px;
  font: normal 18px "Times New Roman", Times, serif;
  color: black;
  text-shadow: 0px 0px 0px Black;
}

.std {
  font: normal small-caps 16px "Verdana", Tahoma, sans-serif;
  color: black;
  text-align: left;
}