html {
    background-color: rgb(26, 26, 26);
}

body {
    display: flex;
    justify-content: center;
    align-content: center;
    margin: 0px;
    padding: 0px;
    width: 100%;
    height: 100%;
}

.container {
    display: inline;
}

.header {
    margin-top: 10px;
    margin-bottom: 10px;
    margin-left: 10px;
    margin-right: 10px;
    height: 150px;
    background-color: greenyellow;
}

.bodycontainer {
    display: inline-flex;
    justify-content: center;
    align-content: center;
    width: 100%;
    height: 600px;
}

.leftcolumn {
    margin-left: 10px;
    width: 300px;
    height: 100%;
    background-color: rgb(88, 88, 88);
}

.centercolumn {
    margin-right: 10px;
    margin-left: 10px;
    width: 700px;
    height: 100%;
    background-color: rgb(88, 88, 88);
}

.rightcolumn {
    margin-right: 10px;
    width: 300px;
    height: 100%;
    background-color: rgb(88, 88, 88);
}

.footer {
    margin-top: 10px;
    margin-bottom: 10px;
    margin-left: 10px;
    margin-right: 10px;
    height: 150px;
    background-color: rgb(88, 88, 88);
}