body {
    background-color: #ACBF88;
}

header {
  width: 90%;
  margin-left: auto;
  margin-right: auto;
}

.logo {
  width:15%
}

nav {
  width: 95%;
  margin-left: auto;
  margin-right: auto;
  background-color: #3E4156;
  overflow: hidden;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

nav ul li {
  float: left;
}

nav ul li a {
  display: block;
  color: white;
  text-align: center;
  padding: 8px;
  text-decoration: none;
}

nav ul li a:hover {
  background:#f0f0f0;
  color:#797979;
}

.content {
  width:90%;
  margin-left: auto;
  margin-right: auto;
}

.submenu {
  display: none;
  position:absolute;
}

.menu:hover .submenu {
  display: block;
}

.submenu li {
  float: none;
  background-color: #3E4156;
}

.visible_table {
  border: 1px solid black;
}

.visible_table tr {
  border: 1px solid black;
}

.visible_table td {
  border: 1px solid black;
}

input[type=text] {
  width: 100%;
  padding: 12px;
  margin: 10px 0;
  box-sizing: border-box;
}

input[type=checkbox] {
  width: 25px;
  height: 25px;
}

input[type=submit] {
  width: 100%;
  height: 50px;
}

.cancel_button {
  width: 100%;
  height: 50px;
}

input[type=date] {
  width: 100%;
  height: 50x;
}

input[type=number] {
  width: 100%;
  height: 50px;
}

select {
  width: 100%;
  height: 50px;
}



@media screen and (max-width: 2000px) {
  .logo {
    width:20%
  }
}

@media screen and (max-width: 1800px) {
  .logo {
    width:25%
  }
}

@media screen and (max-width: 1500px) {
  .logo {
    width:30%
  }
}

@media screen and (max-width: 1000px) {
  .logo {
    width:40%
  }
}

@media screen and (max-width: 800px) {
  header {
    width: 100%;
  }

  .content {
    width:100%;
  }

  ul li {
    float: left;
    width: 100%;
  }

  .logo {
    width:50%
  }
  .submenu {
    display: block;
    position: relative;
  }
}

@media screen and (max-width: 600px) {
  header {
    width: 100%;
  }
  .logo {
    width:100%
  }
  
}