* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  font-family: "Open Sans", sans-serif;
  font-weight: bold;
}

body {
  background-color: rgb(103, 225, 255);
  transition: 0.8s;
  -webkit-transition: 0.8s;
  -moz-transition: 0.8s;
  -ms-transition: 0.8s;
  -o-transition: 0.8s;
}

h1 {
  margin-top: 25vh;
  text-align: center;
  margin-bottom: 1.5%;
  color: rgb(29, 56, 98);
}

.container {
  width: 370px;
}

.result{
  width: 79%;
}

#zero
{
 width: 39.1%;
}

input {
  padding: 25px;
  color: rgb(17, 16, 16);
  font-size: 18px; 
  cursor: pointer;
  width: 70px;
  background-color: rgb(235, 241, 250);
  border: none;
  outline: none;
  border-radius: 4px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
}

.first-row,
.second-row,
.third-row,
.fourth-row,
.fifth-row,
.sixth-row {
  margin-bottom: 3px;
}

input[type="text"] {
  background-color: rgb(255, 255, 255);
}

input[type="button"]:hover {
  background-color: rgb(37, 35, 59);
  color: #fff;
}

.clear {
  color: rgb(0,0,0);
  background-color: rgba(255, 255, 255, 0.5);
}

button {
  border: none;
  background-color: rgb(41, 38, 38);
  padding: 10px;
  color: white;
  margin: 2px;
  cursor: pointer;
  outline: none;
  border-radius: 4px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -ms-border-radius: 4px;
  -o-border-radius: 4px;
  font-size: 0.7;
}

button a {
  text-decoration: none;
  color: #fff;
}

.bottom-buttons {
  float: left;
  margin-left: 10%;
  margin-top: 0.7%;
}

.fab {
  font-size: 1.2em;
}

@media (max-width: 640px) {
  h1 {
    margin-top: 15vh;
  }
}