body {
  height: 740px;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 0;
  margin-top: 10px;
}

.all {
  width: 80%;
  height: 100%;
  display: flex;
  align-items: center;
}

header {
  border: 1px solid black;
  width: 80%;
  height: 20%;
}

.sect {
  display: flex;
  align-items: center;
  width: 100%;
  height: 100%;
}

.left {
  border: 1px solid black;
  width: 250px;
  height: 100%;
  text-align: left;
  border-right: none;
}

.right {
  text-align: left;
  border: 1px solid black;
  width: 250px;
  height: 100%;
  border-left: none;
}

section {
  border: 1px solid black;
  width: 60%;
  height: 100%;
}

footer {
  border: 1px solid black;
  width: 80%;
  height: 20%;
}