* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #4203a9, #042a68);
    color: #fff;
    padding: 10px;
}

.calculator {
    width: 100%;
    max-width: 600px;
    margin-left: 10%;
    margin-top: 10%;
}

.calculator h1 {
    font-size: 60px;

}

.calculator h1 span {
    color: yellow;
}

.input-box {
    margin: 40px 0;
    padding: 35px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
}

.input-box input {
    flex: 1;
    margin-right: 20px;
    padding: 14px 20px;
    border: 0;
    outline: 0;
    font-size: 18px;
    border-radius: 5px;
    position: relative;
}

.input-box button {
    background: #ffff76;
    border: 0;
    outline: 0;
    padding: 15px 30px;
    border-radius: 5px;
    font-weight: 500;
    color: #333;
    cursor: pointer;
}

.input-box input::-webkit-calendar-picker-indicator {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    height: auto;
    position: absolute;
    background-position: calc(100% - 10px);
    background-size: 30px;
    cursor: pointer;
}

#result{
    font-size: 30px;
 
}

#result span{
    color: red;
}

/* resp */
 @media (max-width: 768px) {
     .calculator {
         margin-left: 5%;
         margin-top: 5%;
         max-width: 90%;
     }

     .calculator h1 {
         font-size: 40px;
     }

     .input-box {
         flex-direction: column;
         padding: 20px;
     }

     .input-box input {
         margin-right: 0;
         margin-bottom: 15px;
         width: 100%;
     }

     .input-box button {
         width: 100%;
         padding: 12px 0;
     }

     #result {
         font-size: 24px;
     }
 }

 @media (max-width: 480px) {
     .calculator h1 {
         font-size: 30px;
     }

     .input-box {
         padding: 15px;
     }

     .input-box input {
         padding: 10px 15px;
         font-size: 16px;
     }

     .input-box button {
         padding: 10px 0;
         font-size: 16px;
     }

     #result {
         font-size: 20px;
     }
 }

 /* Footer style */
 .footer {
     text-align: center;
     margin-top: 50px;
     color: #fff;
     font-size: 14px;
     opacity: 0.8;
 }

 @media (max-width: 480px) {
     .footer {
         font-size: 12px;
         margin-top: 30px;
     }
 }