style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;

}
.container{
    max-width: 450px;
    background-color: rgb(7, 16, 71);
    border-radius: 8px;
    box-shadow: 0px 0px 15px 3px rgba(0,0,0,0.4);
    padding: 20px;
}
.title{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap-reverse;
    gap: 10px;
}
.temperature-icon{
    font-size: 45px;
    color:#fff ;
}
h1{
    color: #fff;
    letter-spacing: 1.2px;
    font-size: 30px;
}
#celcius, #fahrenheit, #Kelvin{
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 25px;

}
input{
    flex: 5;
    height: 60px;
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    border: none;
    outline: none;
    border-radius: 8px 0 0 8px;
    padding: 0 10px;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button{
    -webkit-appearance: none;
}

.icon{
    flex: 1;
    height: 60px;
    line-height: 60px;
    padding: 0 5px;
    text-align: center;
    font-size: 30px;
    background: #aed1f1;
    color: #fff;
    border-radius: 0 8px 8px 0;

}
.button{
    margin-top: 25px;
    text-align: center;

}
.button button{
    border: none;
    outline: none;
    padding: 10px 30px;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    border-radius: 10px;
}
.button button:hover{
    background: rgb(0, 0, 150);
    color: #fff;

}