nav {
    background-color: white;
    color: lightskyblue;
    text-align: center;
    margin-left: 10px;
    margin-right: 10px;
}
nav a {
    border: 3px groove skyblue;

}
.dropdown {
    display: inline-block;
    list-style-type: none;
    margin: 0;
    padding: 0;
  }
  
  .dropdown > li {
    position: relative;
    padding: 10px;
    border: 2px solid #ccc;
    display:inline-block;
  }
  
  .dropdown > li > ul {
    display: none;
  }
  
  .dropdown > li:hover > ul {
    list-style-type: none;
    display: block;
    position: absolute;
    left: 0;
    width: 100%;
    background-color: #fff;
    margin: 0;
    padding: 10px;
    border: 1px solid #ddd;
    z-index:1;
  }
table {
    margin-left: 20px;
    margin-right: 20px;
    border: thin solid black;
    caption-side: bottom;
    border-collapse: collapse;
    border-spacing: 0px;
    empty-cells: hide;
    overflow: auto;
}
td, th {
    border: thin dotted gray;
    padding: 5px;
}
tr:nth-child(2n+1) {
    background-color: royalblue;
}
.cellcolor {
    background: rgb(94, 124, 215);
}
caption {
    font-style: italic;
    padding-top: 8px;
    caption-side: top;
}
img, picture, video, iframe {
    max-width: 100%;
    height: auto;
}
body {
    font-family: 'Times New Roman', Times, serif;
    color: black;
    margin: 0;
}

h1, main, .sidebar1, .sidebar2, .sidebar3, header, nav, footer {
    padding: 5px 10px;
    box-sizing: border-box;
}
header {
    background-color:white ;
    color: royalblue;
    text-align: center;
}
footer {
    background-color:white ;
    text-align: center;
    color: royalblue;
    font-size: 90%;
    border-top: 3px groove skyblue;
}
.sidebar2 {
    border: 3px groove skyblue;
    font-size: 105%;
    vertical-align: top;
}
.sidebar3 {
    border: 3px groove skyblue;
    font-size: 105%;
    vertical-align: top;

}
#eb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 35px;
    height: 35px;
}

.sidebar1 {
    border: 3px groove skyblue;
    font-size: 105%;
}
.sidebar4 {
    display: none;
}
@media (min-width:768px) {
.flexcontainer {
    display: flex;
    flex-wrap: wrap;
}
header, nav, footer, .sidebar3 {
    flex-basis: 100%;
    max-width: 100%;
}
.sidebar1 {
    flex-basis: 50%;
    max-width: 50%;
}
.sidebar2 {
    flex-basis: 50%;
    max-width: 50%;
}
#eb {
    width: 70px;
    height: 70px;
}
.sidebar4 {
    display: none;
}
}

@media (min-width:992px) {
.sidebar1, .sidebar3 { 
        flex-basis: 33%;
        max-width: 33%;
    }
.sidebar2 {
        flex-basis: 34%;
        max-width: 34%;
    }
#eb {
    width: 105px;
    height: 105px;
}
.sidebar4 {
    display: none;
}
}
@media (min-width:1200px) {
.sidebar1, .sidebar3 { 
    flex-basis: 33%;
    max-width: 33%;
}
.sidebar2 {
    flex-basis: 34%;
    max-width: 34%;
}
.sidebar4 {
    display: block;
    flex-basis: 100%;
    max-width: 100%;
}
#eb {
width: 140px;
height: 140px;
}
}