/* phoenix.css */
    <style>
.space { margin-top: 300px; }
.space1 { margin-top: 350px; }
.space2 { margin-top: 400px; }
.space3 { margin-top: 450px; }

address {
  display: block;
  font-style: italic;
  font-weight: bold;
}
h1 {
  font-size: 30px;
}

h2 {
  font-size: 24px;
}

p {
  font-size: 16px;
}
#myDIV {
  border: none;
  width: 300px;
  height: 300px;
}
div.a {
  text-indent: 50%;
}

div.b {
  text-indent: -2em;
}

div.c {
  text-indent: 30%;
}
 ul.a {
  list-style-type: none;
  text-decoration: none;
  border: 0px solid #555;
  width: 800px;
  background-color: #ffffff;
}

ul.b {
  list-style-type: none;
  text-decoration: none;
  border: 1px solid #555;
  width: 200px;
  background-color: #ffffff;
  
}

li a {
  display: block;
  color: #191970;
  padding:0px 1px;
  text-decoration: none;
}
li b {
  display: block;
  color: #191970;
  padding:0px 1px;
  text-decoration: none;
}
a:link {
  color:#89CFF0;
  text-decoration: none;
  font-size: 16px;
}
.isDisabled {
  color: currentColor;
  cursor: not-allowed;
  opacity: 0.5;
  text-decoration: none;
}
/* visited link */
a:visited {
  color:#89CFF0;
text-decoration: none;
}

/* mouse over link */
a:hover {
  color:#8000ff;
text-decoration: none;
}

/* selected link */
a:active {
  color:#89CFF0;
  text-decoration: none;
}
table.center {
  margin-left: auto; 
  margin-right: auto;
}


table, th, td {
  border: none ;
}


table {
  border-collapse: collapse;
  width: 50%;
}
.button {
  background-color: #7393B3; /* Green */
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  -webkit-transition-duration: 0.4s; /* Safari */
  transition-duration: 0.4s;
}

.button1 {
  box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}

.button2:hover {
  box-shadow: 5px 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}
body { 
  background-color: #ffffff
  color:#191970;
  }
 .center 
 { display: block;
 margin-left: auto;
  margin-right: auto;
}
div.d {
  font-size: 15px;
  font-weight:bold;
}

div.e {
  font-size: large;
  font-weight:bold;
}

div.f {
  font-size: 150%;
  font-weight:bold;
}
 <style>
.flex-container {
  display: flex;
  background-color: white;
}

.flex-container > div {
  background-color: white;
  margin: 10px;
  padding: 20px;
  font-size: 16px;
}
</style>