style.css

#title {
    margin: 20px;
    font-size: 50px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: -webkit-linear-gradient(0deg, #ff9c12 25%, #ffeb0d);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#result {
    margin: 20px;
    font-size: 30px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: -webkit-linear-gradient(0deg, #ff9c12 25%, #ffeb0d);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

label {
    margin: 10px;
    font-size: 30px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

input[type=text] {
    display: block;
    text-align: center;
    width: 50%;
    padding: 12px 20px;
    margin: 8px auto;
    box-sizing: border-box;
    border: 3px solid #ccc;
    -webkit-transition: 0.5s;
    transition: 0.5s;
    outline: none;
    font-size: large;
    border-radius: 10px;
}
  
input[type=text]:focus {
    border: 3px solid #555;
}

.button {
    display: block;
    margin: 30px auto;
    border-radius: 10px;
    position: relative;
    background-color: #ffac12;
    border: none;
    font-size: 25px;
    color: #FFFFFF;
    padding: 20px;
    width: 150px;
    text-align: center;
    -webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
    text-decoration: none;
    overflow: hidden;
    cursor: pointer;
}

.button:after {
    content: "";
    background: #ffd380;
    display: block;
    position: absolute;
    padding-top: 300%;
    padding-left: 350%;
    margin-left: -20px!important;
    margin-top: -120%;
    opacity: 0;
    transition: all 0.8s
}

.button:active:after {
    padding: 0;
    margin: 0;
    opacity: 1;
    transition: 0s
}

.container {
    display: flex;
    flex-direction: column-reverse;
    justify-content: center;
    align-items: center;
    text-align: center;
}