body{
    margin: 0;
    padding: 0;
    background: #111;
}
.container{
    position: absolute;
    left: 48%;
    top: 45%;
    transform: translate(-50%, -50%);
    padding: 10px;
}
input{
    height: 60px;
    width: 0px;
    outline: none;
    padding: 0 20px;
    color: black;
    font-size: 20px;
    box-sizing: border-box;
    border:solid 1px #D50000;
    border-radius: 50px;
    transition: all .7s ease;
}
::placeholder{
    color: grey;
}
.btn{
    position: absolute;
    right: 0;
    top: 0;
    background: #D50000;
    line-height: 80px;
    height: 80px;
    width: 80px;
    text-align: center;
    border-radius: 50%;
    cursor: pointer;
}
.btn i{
    font-size: 25px;
    line-height: 80px;
    color: white;
    transition: all .7s ease;
}
.container:hover input{
    width: 350px;
}
.container:hover i{
    transform: rotate(-350deg);
}