@import url('https://fonts.googleapis.com/css2?family=Crimson+Text&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Crimson Text';
    outline: none;
}

body {
    background: -webkit-linear-gradient(left, #25c481, #25b7c4);
    background: linear-gradient(to right, #25c481, #25b7c4);
}

.container{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator{
    background-color: #05eedb;
    padding: 15px;
    border-radius: 30px;
    box-shadow: inset 5px 5px 12px rgba(0,0,0,0.16),
                      5px 5px 12px rgba(0,0,0,0.16);
    display: grid;
    grid-template-columns: repeat(4,68px);
}

input{
    grid-column: span 4;
    height: 70px;
    width: 260px;
    background-color: #25b7c4;
    box-shadow: inset -5px -5px 12px rgba(0,0,0,0.16),
                inset 5px 5px 12px rgba(0,0,0,0.16);
    border: none;
    border-radius: 30px;
    color: black;
    font-size: 50px;
    text-align: end;
    margin: auto;
    margin-top: 40px;
    margin-bottom: 30px;
    padding: 20px;
}

button{
    height: 48px;
    width: 48px;
    background-color: #25b7c4;
    box-shadow: -5px -5px 12px rgba(0,0,0,0.16),
                5px 5px 12px rgba(0,0,0,0.16);
    border: none;
    border-radius: 50%;
    margin: 8px;
    font-size: 25px;
}

button:active{
    background-color: #ffffff;
}

.equal{
    width: 115px;
    border-radius: 40px;
    background-color: #25b7c4;
    box-shadow: -5px -5px 12px rgba(0,0,0,0.16),
                5px 5px 12px rgba(0,0,0,0.16);
}

/* footer section styling */
footer{
  background: #111;
  padding: 15px 23px;
  color: #fff;
  text-align: center;
  position: fixed;
  bottom: 0;
  width: 100%;
}
footer span a{
  font-family: Audiowide;
  color: #25b7c4;
  text-decoration: none;
}
footer span a:hover{
  text-decoration: underline;
}