header {
   display: flex;
  width: 100%;
  height: 200px;
  background-color: darkgrey;
  align-items: center;
  border-radius: 1px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
}
nav li {
  margin: 0 10px;
}
.title {
  margin-right: auto;
}
 .ra {
  color: #561b89;
  text-decoration: none;
  transition-duration: 0.5s;
}

.ra:hover {
  background-color: #eee; 
}
 .da {
  color: #561b89;
  text-decoration: none;
  transition-duration: 0.5s;
}

.da:hover {
  background-color: darkgrey; 
  color: #000000;
}

.p {
    width: 50%;
    line-height: 2;
    display: inline-block;
    background-color: #03A9F4;
    padding: 20px;
    position: relative;
    z-index: 999;
    margin: 50px 0 0;
    color: #fff;
    letter-spacing: 2px;
}
 
.a {
    color: #fff;
    text-decoration: none;
    background-color: #17E9FF;
    display: block;
    padding: 15px 25px;
    border-radius: 5px;
    box-shadow: 0 4px 0 0 #9e2b23;
    font-weight: bold;
    width: 300px;
    text-align: center;
    margin: 110px auto 0;
    letter-spacing: 2px;
}

 
html {
    background-color: #a8e4ff;
}
 
body {
    background-color: #fff;
    padding: 30px 30px 30px;
    max-width: 700px;
    margin: 20px auto;
    box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.18);
    border-radius: 3px;
    position: relative;
}