35css/css/style.css

/* ADVANCED styling */
/* sidebar */
#sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  transition: 0.4s;
  overflow: hidden;
  z-index: 2;
}

.sidebar-toggle {
  cursor: pointer;
  font-size: 2em;
  padding: 5px;
}

#sidebar-toggle {
  position: fixed;
  top: 0;
  background-color: inherit;
  z-index: 1;
}

#sidebar-toggle-input {
  display: none;
}

#main {
  position: relative;
  left: 0;
  width: 100%;
}

#sidebar-toggle-input:not(:checked) ~ #sidebar {
  width: 0px;
}

#sidebar-toggle-input:checked ~ #sidebar {
  width: 250px;
}

#sidebar-toggle-input:checked ~ #main {
  left: 250px;
  width: calc(100% - 250px);
}

@media screen and (max-width: 767px) {
  #sidebar-toggle {
    left: auto;
    right: 0;
  }
  #sidebar-toggle-input:checked ~ #sidebar {
    width: 100%;
  }
  #sidebar-toggle-input:checked ~ #main .container {
    width: 100%;
  }
}

@media screen and (min-width: 768px) {
  #sidebar-toggle-input:checked ~ #main .container {
    width: calc(744.96px - 250px);
  }
}

@media screen and (min-width: 992px) {
  #sidebar-toggle-input:checked ~ #main .container {
    width: calc(962.24px - 250px);
  }
}

@media screen and (min-width: 1200px) {
  #sidebar-toggle-input:checked ~ #main .container {
    width: calc(1164px -250px);
  }
}

@media screen and (min-width: 1800px) {
  #sidebar-toggle-input:checked ~ #main .container {
    width: calc(1746px - 250px);
  }
}