img {
    max-width: 100%;
    max-height: 100%;
}

.portrait {
    height: 400px;
    width: 150px;
}

.landscape {
    height: 405px;
    width: 600px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.banner {
    height: auto;
    width: auto;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.square {
    height: 800px;
    width: 800px;
}

.banner {
    height: 128px;
    width: 512px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  
}

.tbox input {
    width: 250px;
    padding: 5px;
    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
    -moz-box-sizing: border-box;    /* Firefox, other Gecko */
    box-sizing: border-box;         /* Opera/IE 8+ */
}
input[type="text"]{
  padding:10px;
}