body {
  padding: 0;
  margin: 0;
  background: linear-gradient(to right, #363636, #a3a3a3);
}

h1 {
  color: white;
  text-align: center;
  font-family: 'Segoe UI', sans-serif;
  font-style: bolder;
  font-size: 40px;
}

button {
  display: inline-block;
  font-size: 2rem;
  cursor: pointer;
  border: 1px solid rgb(0, 0, 0);
  outline: none;
  background-color: rgb(100, 100, 100);
  border-radius: 5px;
}

button:hover {
  background-color: rgb(44, 44, 44);
}

button:active {
  background-color: rgb(44, 44, 44);
  transform: translateY(5px);
}

.calcbtn {
  display: grid;
  justify-content: center;
  align-content: center;
  grid-template-columns: repeat(4, 100px);
  grid-template-rows: minmax(120px, auto) repeat(5, 100px); 
}

.larger {
  grid-column: span 2;
}

.outp {
  grid-column: 1 / -1;
  background-color: rgba(0, 0, 0, 0.514);
  padding: 10px;
  border-radius: 10px;
  border: 2px solid #000000;
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  flex-direction: column;
  word-wrap: break-word;
  word-break: break-all;
}

.outp .previous-operand {
  color: rgb(255, 255, 255);
  font-size: 1.5rem;
  font-family: Verdana, sans-serif;
}

.outp .current-operand {
  color: rgb(255, 255, 255);
  font-size: 2.5rem;
  font-family: Verdana, sans-serif;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  margin: auto;

}

li {
  float: left;
  margin: auto;
  border: 3px solid #000000;
  background-color: rgb(58, 58, 58);
}

li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn {
  background-color: rgb(68, 68, 68);
}

li.dropdown {
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: rgb(116, 116, 116);
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
  margin: auto;
  border: 2px solid #000000;
}

.dropdown-content a:hover {
  background-color: rgb(133, 133, 133);
}

.dropdown:hover .dropdown-content {
  display: block;
}