body{
    padding-top: 90px;
    height: 100vh;
    margin: 0 auto;
    background-color:#fcf8e3;
    background-image: url(apothiki.png);
    background-repeat: repeat-y;
    background-size: cover;
}


nav{
    padding: 10px 0;
    background-color: rgb(229,225,220);
    position: fixed;
    top: 0;
    width: 100%;
}

nav ul li {
    display: inline;
    margin-right: 30px;
}

nav ul li.selected {
    font-weight: bold;
}

nav ul li a{
    text-decoration: none;
    font-size: 1.5em;
    color: black;
}

.main-content{
    margin: 0 auto;
    width: 70%;
    padding-bottom: 40px;
}

form{
    margin-top: 3em;
    text-align: center;
}

.form-group{
    margin-bottom: 20px;
}

.message-warning{
    text-align: center;
    color:red;
}

table
{
   border-collapse:collapse;
}
tr 
{
   border-bottom: 1px solid #000;
}
td{
    padding-left: 10px;
    padding-right: 10px;
}
tr:first-child
{
    font-weight: bold;
}
tr:last-child
{
   border-bottom: none;
}

td input{
    background:#e0e0ff;
    width:50px;
}

td input.date{
    width:110px;
}

td input[type="submit"]{
    width:100px;
}