body {
    font-family: Helvetica, Arial, sans-serif; 
}

header {
    display: flex; /*put things side by side */
    background-color: #78cef3; /* fill */
    height: 2rem; /* 1rem= 16px */ 
    line-height: 2rem; /* line of text = height = vertically centered text */
    color: white; /* text color */
    border-bottom: 4px solid #40911a; /* width + type + cp;pr */
}

h1 {
  font-family: "Sigmar", sans-serif;
  font-weight: 400;
  font-style: normal;
  font-size: 2rem;
  margin: 1rem;
  line-height: 1.2; /*leading*/
}

header p {
  font-family: "Sigmar", sans-serif;
  font-weight: 400;
  font-style: normal;
  font-size: 1.2 rem;
  margin-left: 1rem;
}