body {
    margin: 0;
    padding: 0;
/*    background-color: #f0f8ff;*/
/*    color: #333; */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: stretch;
}
header {
    background-color: #002d57;
    color: white;
    text-align: center;
    padding: 10px;
}
header h2 {
    color: #eee;
}

.hero {
    /*background-color: #e6f2ff;*/
    text-align: center;
    padding: 50px 20px;
}
.details, .speakers, .contact {
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
}
main {
    /*border-top: #002d57 2px dashed;*/
}

.speakers ul {
    list-style: none;
    padding: 0;
}
.speakers li {
    background: #cce0ff;
    margin: 10px 0;
    padding: 10px;
    border-radius: 5px;
}
.contact form {
    display: flex;
    flex-direction: column;
}
.contact input, .contact textarea {
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #004080;
    border-radius: 5px;
}
.contact button {
    background-color: #004080;
    color: white;
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
footer {
    background-color: #004080;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
    max-height: 50px;
}

nav {
    font-weight: bold;
}

nav li {
    padding-left: 10px;
    padding-right: 10px;
    text-transform: uppercase;
}