body {
  --slack-color: #3f0e40;
  overflow: hidden;
}

.app__body {
  display: flex;
  height: 100vh;
}

.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.overlay__show {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 70px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 50%;
  position: relative;
  transition: all 5s ease-in-out;
}

.popup h2 {
  margin-top: 0;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
  cursor: pointer;
}
.popup .close:hover {
  color: var(--slack-color);
}
.popup .content {
  max-height: 30%;
  overflow: auto;
  margin: 20px 0;
}

#add-channel-form {
  display: flex;
  flex-direction: column;
}

#add-channel-form > .form-control {
  margin-bottom: 10px;
  padding: 10px;
  color: gray;
  border-radius: 9px;
  border: 1px solid gray;
}

#add-channel-form > .form-btn {
  border: none;
  padding: 10px;
  color: gray;
  border-radius: 9px;
  cursor: pointer;
}

#add-channel-form > .form-btn:hover {
  color: white;
  background-color: var(--slack-color);
  transition: all 0.3s ease-in-out;
}

#add-channel-form > .form-control,
#add-channel-form > .form-btn:focus {
  outline: none;
}