style.css

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: #293f50;
    margin: 0;
}

.header {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

h1, h2, h3, h4, h5, p{
    color: white;
    margin-bottom: 30px;
}

.flex-header {
    flex-basis: 30%;
}

.intro {
    flex-basis: 100%;
    text-align: center;
    font-size: 25px;
    margin: 10px 0 90px 0;
}

.intro p{
    color: white;
}

.logo {
    border-top: 5px solid #648880;
    font-size: 50px;
}

.date {
    text-align: right;
    margin-right: 5px;
}

.date a {
    padding: 10px;
}

.reg {
    border: 1px solid #648880;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 15px;
}

a {
    color: white;
    text-decoration: none;
}

a:hover {
    color: #648880;
}

h2, h3 {
    color: #648880;
}

div h4, p {
    color: #648880;
}

div h4 {
    color: #293f50;
    font-weight: 600;
    text-transform: uppercase;
}

.index-section {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    text-align: center;
    background-color: white;
}

.index-sec {
    flex-basis: 20%;
    cursor: pointer;
    padding: 10rem 0 10rem 0;
}

footer {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    padding: 5rem 0;
}

footer a {
    text-align: right;
    flex-basis: 30%;
    padding: 5px;
}

img {
    height: 130px;
}

.speaker {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    text-align: left;
    padding-left: 15px;
    background-color: white;
    cursor: pointer;
}

.speaker-flex {
    flex-basis: 30%;
}

.speaker p {
    font-weight: 200;
}

.speaker-info {
    border: 1px solid #648880;
    border-radius: 5px;
    padding: 40px;
    text-align: center;
}

.speaker-bottom {
    margin: 125px;
}

.speaker-image {
    border-radius: 50%;
    margin: -60px 30px;
}

.speaker-p {
    font-size: 20px;
    color: black;
}

.venue {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    background-color: white;
}

.venue a {
    color: black;
}

.venue section {
    flex-basis: 40%;
    padding: 20px 10px;
}

iframe {
    padding: 10px 50px;
}

.register {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-areas: 
    "a b"
    "c c";
    background-color: white;
    padding: 10px;
}

.register fieldset {
    width: 50%;
    color: #648880;
    display: block;
    margin: 50px 0 20px 0;
    padding: 5px 8px;
    border-radius: 10px;
}

label {
    display: block;
    padding-top: 1rem;
}

input {
    background-color: #648880;
}

button {
    padding: 10px;
    border: none;
    border-radius: 5px;
    background-color: #648880;
}

table {
    margin-bottom: 44px;
    width: 100%;
}

table:last-child {
    margin-bottom: 0;
}

.row {
    background-color: white;
    min-width: 960px;
    padding: 66px 0 44px 0;
}

.container {
    display: flex;
    justify-content: space-between;
}

th,
td {
    padding-bottom: 22px;
    vertical-align: top;
}

th {
    padding-right: 45px;
    text-align: right;
    width: 20px;
}

td {
    width: 40px;
}

thead {
    line-height: 44px;
}

thead th {
    color: #648880;
}

tbody th {
    color: #a9b2b9;
    font-size: 14px;
    font-weight: 400;
    padding-top: 22px;
    text-transform: uppercase;
}
  
tbody td {
    border-top: 1px solid #dfe2e5;
    padding-top: 21px;
}
  tbody td:first-of-type {
    padding-right: 15px;
  }
  tbody td:last-of-type {
    padding-left: 15px;
  }
  tbody td:only-of-type {
    padding-left: 0;
    padding-right: 0;
  }
  
  table a {
    color: #888;
  }
  table h4 {
    margin-bottom: 0;
  }
  
  .schedule-offset {
    color: #a9b2b9;
  }

.container {
    display: flex;
    justify-content: space-between;
    cursor: pointer;
    font-weight: 400;
    letter-spacing: .5px;
    margin: 0;
    text-transform: uppercase;
    color: #fff;    
    border: 1px solid #fff;
    padding: 10px 30px;
    background: #fff;
    color: #648880;
}