style.css

*{
    margin:0px;
    padding: 0px;
    outline: none;
    box-sizing: border-box;
    overflow: hidden;
}
body{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: column;
}

.container{
    height: 25rem;
    width: 20rem;
    background-color: silver;
    border: 1px solid black;
    display: flex;
    flex-flow: column;
    align-items: center;
}

.container h2{
    background-color: rgb(103, 22, 22);
    color: #fff;
    width: 100%;
    margin-top: 0px;
    text-align: center;
    font-size: 30px;
}
.container .from{
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 20px;
    gap: 5px;
    font-size: 20px;
    margin-bottom: 10px;
}
.container .from select{
    font-size: 16px;
}
.container .to{
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0px;
    gap: 5px;
    font-size: 20px;
    margin-bottom: 10px;
}
.container .to select{
    font-size: 16px;
}

.Temperature-icon{
    padding-top: 5px;
    font-size: 45px;
    color: rgb(103, 22, 22);
}
.takevalue{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.takevalue p{
    margin-top: 8px;
    font-size: 20px;
    margin-bottom: 8px;
}
.takevalue input{
    font-size: 17px;
}
.btn{
    margin-top: 10px;   
}
button{
    font-size: 15px;
    font-weight: 500;
    padding: 5px;
    cursor: pointer;
    background-color: gray;
    color: #fff;
    border: 1px solid black;
    border-radius: 5px;
}
#result{
    margin-top: 30px;
    height: 70px;
    width: 80%;
    border:2px solid black;
    text-align: center;
    font-size: 20px;
    padding-top: 20px;
    background-color: cyan;
    font-weight: 700;
}