.form-block{
    display: inline-block;
    width: 100%;  
}
  
.form-block-input{
    font-family: inherit;
    font-size: inherit;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    box-sizing: border-box;
    border: 1px solid #ccc;
} 

.form-block-btn{
    font-family: inherit;
    font-size: 17px;
    padding: 12px 20px;
    margin: 8px 0;        
    cursor: pointer;
    display: block;
    text-align: center;
    border: 0px solid red;
}